Fix right scrollbar position

Author: GuillaumeGomez

Diff for: templates/style.scss

@@ -143,7 +143,6 @@ div.container {
 }
 
 div.container-rustdoc {
-    max-width: 1200px;
     text-align: left;
 }
 
@@ -177,6 +176,8 @@ div.nav-container {
     }
 
     form.landing-search-form-nav {
+        max-width: 1200px;
+
         input.search-input-nav {
             float: right;
             max-width: 200px;