Retain the table.simple style from ReSpec

The licenses of both repos are the same.

Author: foolip

index.bs

@@ -55,6 +55,37 @@ ul.brief li:last-child::after { content: "" }
 
 /* dl.subcategories when the definition list subdivides a definition */
 dl.subcategories { margin-left: 2em }
+
+/* table.simple for more readable tables
+   Source: https://github.com/w3c/respec/blob/7faae154e57d4af864a83b50adf744029fbd7496/assets/respec.css */
+table.simple {
+  border-spacing: 0;
+  border-collapse: collapse;
+  border-bottom: 3px solid #005a9c;
+}
+.simple th {
+  background: #005a9c;
+  color: #fff;
+  padding: 3px 5px;
+  text-align: left;
+}
+.simple th a {
+  color: #fff;
+  padding: 3px 5px;
+  text-align: left;
+}
+.simple th[scope="row"] {
+  background: inherit;
+  color: inherit;
+  border-top: 1px solid #ddd;
+}
+.simple td {
+  padding: 3px 10px;
+  border-top: 1px solid #ddd;
+}
+.simple tr:nth-child(even) {
+  background: #f0f6ff;
+}
 </style>
 
 <section>