Use same text color for commit box as issue title

app/assets/stylesheets/pages/commit.scss

@@ -2,10 +2,6 @@
   display: block;
 }
 
-.commit-title{
-  margin-bottom: 10px;
-}
-
 .commit-author, .commit-committer{
   display: block;
   color: #999;
@@ -41,6 +37,8 @@
 .commit-box {
   .commit-title {
     margin: 0;
+    font-size: 23px;
+    color: #313236;
   }
 
   .commit-description {