fix

frontend/app/components/comment/_replying/comment_replying.scss

@@ -1,4 +1,6 @@
 .comment_replying {
+  padding-bottom: 0;
+
   .comment__score {
     top: 4px;
     right: 0;
@@ -7,7 +9,6 @@
   /* 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;
-    padding-bottom: 0;
 
     .comment__body {
       padding: 8px 8px 0;

frontend/app/components/comment/comment.scss

@@ -19,3 +19,7 @@
     padding-left: 0;
   }
 }
+
+.comment-form_type_reply {
+  margin-left: 17px;
+}

frontend/app/components/thread/__collapse/thread__collapse.scss

@@ -1,5 +1,5 @@
 .thread__collapse {
-  height: 100%;
+  height: calc(100% - 50px);
   width: 11px;
   position: absolute;
   top: 50px;