Small fixes on code blocks in rustdoc

Author: GuillaumeGomez

src/librustdoc/html/static/main.js

@@ -2262,17 +2262,17 @@
     onEach(document.getElementsByClassName('rust-example-rendered'), function(e) {
         if (hasClass(e, 'compile_fail')) {
             e.addEventListener("mouseover", function(event) {
-                e.previousElementSibling.childNodes[0].style.color = '#f00';
+                this.parentElement.previousElementSibling.childNodes[0].style.color = '#f00';
             });
             e.addEventListener("mouseout", function(event) {
-                e.previousElementSibling.childNodes[0].style.color = '';
+                this.parentElement.previousElementSibling.childNodes[0].style.color = '';
             });
         } else if (hasClass(e, 'ignore')) {
             e.addEventListener("mouseover", function(event) {
-                e.previousElementSibling.childNodes[0].style.color = '#ff9200';
+                this.parentElement.previousElementSibling.childNodes[0].style.color = '#ff9200';
             });
             e.addEventListener("mouseout", function(event) {
-                e.previousElementSibling.childNodes[0].style.color = '';
+                this.parentElement.previousElementSibling.childNodes[0].style.color = '';
             });
         }
         lineNumbersFunc(e);

src/librustdoc/html/static/rustdoc.css

@@ -284,6 +284,7 @@ nav.sub {
 
 body:not(.source) .example-wrap {
 	display: inline-flex;
+	margin-bottom: 10px;
 }
 
 .example-wrap {
@@ -303,6 +304,10 @@ body:not(.source) .example-wrap > pre.rust {
 	width: 100%;
 }
 
+body:not(.source) .example-wrap > pre {
+	margin: 0;
+}
+
 #search {
 	margin-left: 230px;
 	position: relative;