style updates

Author: hughsk

index.css

@@ -56,6 +56,11 @@
   color: #4A4F5E;
 }
 
+.stackgl-readme h3 + h3,
+.stackgl-readme h4 + h4 {
+  margin-top: -0.5em;
+}
+
 .stackgl-readme h2 + h3 {
   margin-top: 0;
 }
@@ -229,3 +234,16 @@
 .stackgl-readme ::-webkit-scrollbar-thumb:active {
   background: #A9B0C2;
 }
+
+/**
+ * iframes
+ */
+.stackgl-readme iframe {
+  width: 100%;
+  height: 300px;
+  border: 0;
+}
+
+.stackgl-readme h1 + iframe {
+  margin-top: 2rem;
+}