diff --git a/web/app/components/comment/_editing/comment_editing.scss b/web/app/components/comment/_editing/comment_editing.scss
index 1fac8c17..125cb852 100644
--- a/web/app/components/comment/_editing/comment_editing.scss
+++ b/web/app/components/comment/_editing/comment_editing.scss
@@ -12,7 +12,7 @@
     right: 0;
   }
 
-  // it isn't mobile first, but it's fine here
+  /* it isn't mobile first, but it's fine here */
   @media (-moz-touch-enabled: 1) and (max-width: 768px), (pointer: coarse) and (max-width: 768px) {
     border: 8px solid #eee;
     padding-bottom: 0;
diff --git a/web/app/components/comment/_level/comment_level.scss b/web/app/components/comment/_level/comment_level.scss
index bb3c39b3..f60a6040 100644
--- a/web/app/components/comment/_level/comment_level.scss
+++ b/web/app/components/comment/_level/comment_level.scss
@@ -1,14 +1,14 @@
 $step: 24px;
 
-@for $i from 1 through 5 {
+@for $i from 1 to 5 {
   .comment_level {
-    &_#{$i} {
-      padding-left: $i * $step;
+    &_$(i) {
+      padding-left: calc($i * $step);
 
       &.comment_replying {
         .comment__input {
           @media (-moz-touch-enabled: 1) and (max-width: 768px), (pointer: coarse) and (max-width: 768px) {
-            margin-left: -$i * $step;
+            margin-left: calc(-$i * $step);
           }
         }
       }
diff --git a/web/app/components/comment/_replying/comment_replying.scss b/web/app/components/comment/_replying/comment_replying.scss
index 93d5a0f8..c57ade16 100644
--- a/web/app/components/comment/_replying/comment_replying.scss
+++ b/web/app/components/comment/_replying/comment_replying.scss
@@ -8,7 +8,7 @@
     right: 0;
   }
 
-  // it isn't mobile first, but it's fine here
+  /* it isn't mobile first, but it's fine here */
   @media (-moz-touch-enabled: 1) and (max-width: 768px), (pointer: coarse) and (max-width: 768px) {
     border: 8px solid #eee;
     padding-bottom: 0;
diff --git a/web/app/components/input/__field/input__field.scss b/web/app/components/input/__field/input__field.scss
index 18183e70..966b6180 100644
--- a/web/app/components/input/__field/input__field.scss
+++ b/web/app/components/input/__field/input__field.scss
@@ -3,7 +3,7 @@
   $fontSize: 16px;
   $paddingVrt: 10px;
   $lines: 3;
-  $height: $fontSize * $lineHeight * $lines + $paddingVrt * 2;
+  $height: calc($fontSize * $lineHeight * $lines+$paddingVrt * 2);
 
   box-sizing: border-box;
   width: 100%;
@@ -17,8 +17,8 @@
   background: #fff;
   border: 0;
   resize: none;
-  backface-visibility: hidden; // let's try to fix blinking in Safari
-  transform: translateZ(0); // let's try to fix blinking in Safari, again
+  backface-visibility: hidden; /* let's try to fix blinking in Safari */
+  transform: translateZ(0); /* let's try to fix blinking in Safari, again */
 
   &:focus {
     box-shadow: inset 0 0 0 2px #259c9a;
diff --git a/web/app/components/input/input.scss b/web/app/components/input/input.scss
index 7afc6e06..27dcf745 100644
--- a/web/app/components/input/input.scss
+++ b/web/app/components/input/input.scss
@@ -4,5 +4,5 @@
   font-size: 0;
   border: 12px solid #eee;
   border-radius: 2px;
-  background: #fff; // try to fix textarea blinking in Safari
+  background: #fff; /* try to fix textarea blinking in Safari */
 }
diff --git a/web/app/components/raw-content/raw-content.scss b/web/app/components/raw-content/raw-content.scss
index 386bcded..405b6f2d 100644
--- a/web/app/components/raw-content/raw-content.scss
+++ b/web/app/components/raw-content/raw-content.scss
@@ -8,7 +8,7 @@
       margin-top: 8px;
     }
 
-    // imported comments have br instead of p
+    /* imported comments have br instead of p */
     br {
       content: '';
       display: block;
@@ -125,7 +125,7 @@
   sub {
     sup,
     sub {
-      vertical-align: middle; // to prevent some visual cheats
+      vertical-align: middle; /* to prevent some visual cheats */
     }
   }
 }
diff --git a/web/package-lock.json b/web/package-lock.json
index 232cef50..d38d525b 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -39,12 +39,6 @@
       "integrity": "sha1-X6rZwsB/YN12dw9xzwJbYqY8/U4=",
       "dev": true
     },
-    "abbrev": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true
-    },
     "accepts": {
       "version": "1.3.4",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.4.tgz",
@@ -209,48 +203,6 @@
       "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
       "dev": true
     },
-    "are-we-there-yet": {
-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
-      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
-      "dev": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
-      },
-      "dependencies": {
-        "isarray": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
-          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-          "dev": true
-        },
-        "readable-stream": {
-          "version": "2.3.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
-          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
-          "dev": true,
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.3",
-            "isarray": "~1.0.0",
-            "process-nextick-args": "~2.0.0",
-            "safe-buffer": "~5.1.1",
-            "string_decoder": "~1.1.1",
-            "util-deprecate": "~1.0.1"
-          }
-        },
-        "string_decoder": {
-          "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
-          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
-          "dev": true,
-          "requires": {
-            "safe-buffer": "~5.1.0"
-          }
-        }
-      }
-    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
@@ -411,12 +363,6 @@
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
-    "async-foreach": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/async-foreach/-/async-foreach-0.1.3.tgz",
-      "integrity": "sha1-NhIfhFwFeBct5Bmpfb6x0W7DRUI=",
-      "dev": true
-    },
     "async-limiter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
@@ -1506,15 +1452,6 @@
       "integrity": "sha1-RqoXUftqL5PuXmibsQh9SxTGwgU=",
       "dev": true
     },
-    "block-stream": {
-      "version": "0.0.9",
-      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
-      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
-      "dev": true,
-      "requires": {
-        "inherits": "~2.0.0"
-      }
-    },
     "bluebird": {
       "version": "3.5.1",
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.1.tgz",
@@ -1582,15 +1519,6 @@
       "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
       "dev": true
     },
-    "boom": {
-      "version": "2.10.1",
-      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
-      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
-      "dev": true,
-      "requires": {
-        "hoek": "2.x.x"
-      }
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -2415,12 +2343,6 @@
         "date-now": "^0.1.4"
       }
     },
-    "console-control-strings": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
-      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-      "dev": true
-    },
     "constants-browserify": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/constants-browserify/-/constants-browserify-1.0.0.tgz",
@@ -2631,15 +2553,6 @@
         "which": "^1.2.9"
       }
     },
-    "cryptiles": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz",
-      "integrity": "sha1-O9/s3GCBR8HGcgL6KR59ylnqo7g=",
-      "dev": true,
-      "requires": {
-        "boom": "2.x.x"
-      }
-    },
     "crypto-browserify": {
       "version": "3.12.0",
       "resolved": "https://registry.npmjs.org/crypto-browserify/-/crypto-browserify-3.12.0.tgz",
@@ -2802,6 +2715,12 @@
         }
       }
     },
+    "css-unit-converter": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/css-unit-converter/-/css-unit-converter-1.1.1.tgz",
+      "integrity": "sha1-2bkoGtz9jO2TW9urqDeGiX9k6ZY=",
+      "dev": true
+    },
     "css-what": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.0.tgz",
@@ -2874,6 +2793,12 @@
             "postcss-value-parser": "^3.2.3"
           }
         },
+        "balanced-match": {
+          "version": "0.4.2",
+          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.4.2.tgz",
+          "integrity": "sha1-yz8+PHMtwPAe5wtAPzAuYddwmDg=",
+          "dev": true
+        },
         "browserslist": {
           "version": "1.7.7",
           "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-1.7.7.tgz",
@@ -2923,6 +2848,28 @@
             "supports-color": "^3.2.3"
           }
         },
+        "postcss-calc": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/postcss-calc/-/postcss-calc-5.3.1.tgz",
+          "integrity": "sha1-d7rnypKK2FcW4v2kLyYb98HWW14=",
+          "dev": true,
+          "requires": {
+            "postcss": "^5.0.2",
+            "postcss-message-helpers": "^2.0.0",
+            "reduce-css-calc": "^1.2.6"
+          }
+        },
+        "reduce-css-calc": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/reduce-css-calc/-/reduce-css-calc-1.3.0.tgz",
+          "integrity": "sha1-dHyRTgSWFKTJz7umKYca0dKSdxY=",
+          "dev": true,
+          "requires": {
+            "balanced-match": "^0.4.2",
+            "math-expression-evaluator": "^1.2.14",
+            "reduce-function-call": "^1.0.1"
+          }
+        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -3055,16 +3002,6 @@
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
       "dev": true
     },
-    "decamelize-keys": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/decamelize-keys/-/decamelize-keys-1.1.0.tgz",
-      "integrity": "sha1-0XGoeTMlKAfrPLYdwcFEXQeN8tk=",
-      "dev": true,
-      "requires": {
-        "decamelize": "^1.1.0",
-        "map-obj": "^1.0.0"
-      }
-    },
     "decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
@@ -3151,12 +3088,6 @@
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
       "dev": true
     },
-    "delegates": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
-      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
-      "dev": true
-    },
     "depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -3347,6 +3278,15 @@
         "domelementtype": "1"
       }
     },
+    "dot-prop": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/dot-prop/-/dot-prop-4.2.0.tgz",
+      "integrity": "sha512-tUMXrxlExSW6U2EXiiKGSBVdYgtV8qlHL+C10TsW4PURY/ic+eaysnSkwB4kA/mBlCyy/IKDJ+Lc3wbWeaXtuQ==",
+      "dev": true,
+      "requires": {
+        "is-obj": "^1.0.0"
+      }
+    },
     "duplexer": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
@@ -4447,15 +4387,6 @@
       "integrity": "sha1-gQaNKVqBQuwKxybG4iAMMPttXoA=",
       "dev": true
     },
-    "for-own": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/for-own/-/for-own-1.0.0.tgz",
-      "integrity": "sha1-xjMy9BXO3EsE2/5wz4NklMU8tEs=",
-      "dev": true,
-      "requires": {
-        "for-in": "^1.0.1"
-      }
-    },
     "foreach": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/foreach/-/foreach-2.0.5.tgz",
@@ -5096,18 +5027,6 @@
         }
       }
     },
-    "fstream": {
-      "version": "1.0.11",
-      "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
-      "integrity": "sha1-XB+x8RdHcRTwYyoOtLcbPLD9MXE=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.2",
-        "inherits": "~2.0.0",
-        "mkdirp": ">=0.5 0",
-        "rimraf": "2"
-      }
-    },
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -5120,22 +5039,6 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
     },
-    "gauge": {
-      "version": "2.7.4",
-      "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
-      "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
-      "dev": true,
-      "requires": {
-        "aproba": "^1.0.3",
-        "console-control-strings": "^1.0.0",
-        "has-unicode": "^2.0.0",
-        "object-assign": "^4.1.0",
-        "signal-exit": "^3.0.0",
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1",
-        "wide-align": "^1.1.0"
-      }
-    },
     "get-caller-file": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.2.tgz",
@@ -5385,12 +5288,6 @@
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
       "dev": true
     },
-    "has-unicode": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
-      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
-      "dev": true
-    },
     "has-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-value/-/has-value-1.0.0.tgz",
@@ -5462,18 +5359,6 @@
         "minimalistic-assert": "^1.0.0"
       }
     },
-    "hawk": {
-      "version": "3.1.3",
-      "resolved": "https://registry.npmjs.org/hawk/-/hawk-3.1.3.tgz",
-      "integrity": "sha1-B4REvXwWQLD+VA0sm3PVlnjo4cQ=",
-      "dev": true,
-      "requires": {
-        "boom": "2.x.x",
-        "cryptiles": "2.x.x",
-        "hoek": "2.x.x",
-        "sntp": "1.x.x"
-      }
-    },
     "he": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
@@ -5491,12 +5376,6 @@
         "minimalistic-crypto-utils": "^1.0.1"
       }
     },
-    "hoek": {
-      "version": "2.16.3",
-      "resolved": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz",
-      "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
-      "dev": true
-    },
     "home-or-tmp": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/home-or-tmp/-/home-or-tmp-2.0.0.tgz",
@@ -5819,12 +5698,6 @@
       "integrity": "sha1-khi5srkoojixPcT7a21XbyMUU+o=",
       "dev": true
     },
-    "in-publish": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/in-publish/-/in-publish-2.0.0.tgz",
-      "integrity": "sha1-4g/146KvwmkDILbcVSaCqcf631E=",
-      "dev": true
-    },
     "indent-string": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/indent-string/-/indent-string-2.1.0.tgz",
@@ -7072,15 +6945,6 @@
       "integrity": "sha1-NJptRMU6Ud6JtAgFxdXlm0F9M0A=",
       "dev": true
     },
-    "json-stable-stringify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
-      "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
-      "dev": true,
-      "requires": {
-        "jsonify": "~0.0.0"
-      }
-    },
     "json-stable-stringify-without-jsonify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
@@ -7105,12 +6969,6 @@
       "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
       "dev": true
     },
-    "jsonify": {
-      "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/jsonify/-/jsonify-0.0.0.tgz",
-      "integrity": "sha1-LHS27kHZPKUbe1qu6PUDYx0lKnM=",
-      "dev": true
-    },
     "jsprim": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
@@ -7859,18 +7717,6 @@
       "integrity": "sha1-soqmKIorn8ZRA1x3EfZathkDMaY=",
       "dev": true
     },
-    "lodash.clonedeep": {
-      "version": "4.5.0",
-      "resolved": "https://registry.npmjs.org/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz",
-      "integrity": "sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=",
-      "dev": true
-    },
-    "lodash.debounce": {
-      "version": "4.0.8",
-      "resolved": "https://registry.npmjs.org/lodash.debounce/-/lodash.debounce-4.0.8.tgz",
-      "integrity": "sha1-gteb/zCmfEAF/9XiUVMArZyk168=",
-      "dev": true
-    },
     "lodash.memoize": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
@@ -7883,12 +7729,6 @@
       "integrity": "sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=",
       "dev": true
     },
-    "lodash.tail": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/lodash.tail/-/lodash.tail-4.1.1.tgz",
-      "integrity": "sha1-0jM6NtnncXyK0vfKyv7HwytERmQ=",
-      "dev": true
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diff --git a/web/package.json b/web/package.json
index c9985da0..902d2bee 100644
--- a/web/package.json
+++ b/web/package.json
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     "postcss-url": "^6.3.1",
     "postcss-wrap": "0.0.4",
     "prettier": "^1.13.7",
-    "sass-loader": "^6.0.7",
     "style-loader": "^0.19.1",
     "webpack": "^3.12.0",
     "webpack-bundle-analyzer": "^2.13.1",
diff --git a/web/webpack.config.js b/web/webpack.config.js
index 38689684..444d693f 100644
--- a/web/webpack.config.js
+++ b/web/webpack.config.js
@@ -24,6 +24,10 @@ const commonStyleLoaders = [
     loader: 'postcss-loader',
     options: {
       plugins: [
+        require('postcss-for'),
+        require('postcss-simple-vars'),
+        require('postcss-nested'),
+        require('postcss-calc'),
         require('autoprefixer')({ browsers: ['> 1%'] }),
         require('postcss-url')({ url: 'inline', maxSize: 5 }),
         require('postcss-wrap')({ selector: `#${NODE_ID}` }),
@@ -31,12 +35,6 @@ const commonStyleLoaders = [
       ],
     },
   },
-  {
-    loader: 'sass-loader',
-    options: {
-      includePaths: [path.resolve(__dirname, 'app')],
-    },
-  },
 ];
 
 module.exports = {