Merge pull request readthedocs#3569 from davidfischer/firefox-build-page-fix

Fix for build screen in firefox

Author: ericholscher

readthedocs/builds/static/builds/css/detail.css

@@ -114,7 +114,6 @@ div.build-command div.build-command-output {
 div.build-command div.build-command-run > span,
 div.build-command div.build-command-output > span {
     display: block;
-    margin-bottom: -16px;
     font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
     white-space: pre;
     overflow-x: scroll;
@@ -124,7 +123,7 @@ div.build-command div.build-command-output > span {
 div.build-command div.build-command-run > span::-webkit-scrollbar,
 div.build-command div.build-command-output > span::-webkit-scrollbar {
     -webkit-appearance: none;
-    height: 15px;
+    height: 0px;
 }
 
 div.build-command div.build-command-output > span {