update doc style

doc/themes/next/source/css/_custom/custom.styl

@@ -1,5 +1,28 @@
 // Custom styles.
 
+.table-container table{
+  background-color: #eee;
+  border-collapse:separate;
+  border-spacing: 0 4px;
+  padding: 0 6px 2px 6px;
+}
+
+.table-container th, td{
+  border: 0;
+}
+
+.table-container tr td:first-child{
+  border-radius: 4px 0 0 4px;
+}
+
+.table-container tr td:last-child{
+  border-radius: 0 4px 4px 0;
+}
+
+.table-container tbody > tr {
+    background-color: white !important;
+}
+
 ::-webkit-scrollbar {
   width: 8px;
   height: 8px;