improve tables

doc/themes/leon/static/css/leon.css_t

@@ -502,3 +502,35 @@ and (max-device-width : 768px) {
         float: none !important;
     }
 }
+
+table {
+  width: 100%;
+  max-width: 100%;
+  margin-bottom: 20px;
+  background-color: transparent;
+  border-spacing: 0;
+  border-collapse: collapse;
+  border: 0px;
+}
+
+table>tbody>tr>td, table>tbody>tr>th, table>tfoot>tr>td, table>tfoot>tr>th, table>thead>tr>td, table>thead>tr>th {
+  padding: 8px;
+  line-height: 1.42857143;
+  vertical-align: top;
+  border-top: 1px solid #ddd;
+  border-left: 0px;
+  border-right: 0px;
+  border-bottom: 0px;
+}
+
+table>thead>tr:first-child>th {
+  border-top: 0;
+  border-bottom: 2px solid #ddd;
+}
+
+table>tbody>tr:nth-of-type(odd) {
+  background-color: #f9f9f9;
+}
+table>tbody>tr:hover {
+  background-color: #f5f5f5;
+}