update main.css (popup stuff for coping text via JavaScript).

static/css/main.css

@@ -686,6 +686,23 @@ hr {
     background: red;
 }
 
+.be-popup-container {
+    position: relative;
+    display: inline-block;
+}
+
+.be-popup {
+    background: palevioletred;
+    color: white;
+    padding: 8px;
+    border-radius: 8px;
+    visibility: hidden;
+    position: absolute;
+    left: 20px;
+    top: -20px;
+    z-index: 10;
+}
+
 .fe-site-header {
     display: flex;
     flex-direction: column;