Reduced diff email CSS

app/assets/stylesheets/mailers/repository_push_email.scss

@@ -11,41 +11,28 @@
 // explicit child selectors.
 
 table.code {
-  width: 100%;
   font-family: monospace;
-  border: none;
-  border-collapse: separate;
-  margin: 0;
-  padding: 0;
+  font-size: $code_font_size;
   -premailer-cellpadding: 0;
   -premailer-cellspacing: 0;
   -premailer-width: 100%;
 
-  > tr > td {
+  tr {
     line-height: $code_line_height;
-    font-family: monospace;
-    font-size: $code_font_size;
+  }
 
-    &.diff-line-num {
-      margin: 0;
-      padding: 0;
-      border: none;
+  .diff-line-num {
     padding: 0 5px;
-      border-right: 1px solid;
     text-align: right;
-      min-width: 35px;
     max-width: 50px;
     width: 35px;
+    border-right-width: 1px;
+    border-right-style: solid;
   }
 
-    &.line_content {
-      display: block;
-      margin: 0;
-      padding: 0 0.5em;
-      border: none;
+  .line_content {
     white-space: pre;
   }
-  }
 }
 
 .line-numbers, .diff-line-num {
@@ -57,32 +44,24 @@ table.code {
 }
 
 pre.code, .diff-line-num {
-  border-color: $table-border-gray;
-}
-
-.code.white, pre.code, .line_content {
-  background-color: #fff;
-  color: #333;
+  border-right: 1px solid $table-border-gray;
 }
 
 .diff-line-num {
   &.old {
     background-color: $line-number-old;
-    border-color: $line-removed-dark;
+    border-right-color: $line-removed-dark;
   }
 
   &.new {
     background-color: $line-number-new;
-    border-color: $line-added-dark;
-  }
-
-  &.hll:not(.empty-cell) {
-    background-color: $line-number-select;
-    border-color: $line-select-yellow-dark;
+    border-right-color: $line-added-dark;
   }
 }
 
 .line_content {
+  background-color: #fff;
+
   &.old {
     background-color: $line-removed;
 
@@ -103,14 +82,6 @@ pre.code, .diff-line-num {
     color: $black-transparent;
     background-color: $match-line;
   }
-
-  &.hll:not(.empty-cell) {
-    background-color: $line-select-yellow;
-  }
-}
-
-pre > .hll {
-  background-color: #f8eec7 !important;
 }
 
 span.highlight_word {