tweaking table styles

Author: perrygovier

src/css/custom.css

@@ -216,14 +216,13 @@ table {
   margin: 2em 0;
   overflow-x: auto;
   width: 100%;
+  display: inline-table;
 }
 
 table,
 td,
 th {
   border-collapse: collapse;
-  border-color: var(--line-rule-color);
-  border-style: solid;
 }
 
 td,
@@ -234,6 +233,10 @@ th {
   text-align: left;
 }
 
+thead th:empty {
+  display: none;
+}
+
 thead th,
 tbody tr:nth-child(even) {
   background-color: var(--ifm-table-stripe-background);