Added informative text for selecting image tags.

src/components/ImageCard.react.js

@@ -144,6 +144,7 @@ var ImageCard = React.createClass({
     return (
       <div className="image-item">
         <div className="tag-overlay" onClick={self.handleCloseTagOverlay}>
+          <p>Please select an image tag.</p>
           {tags}
         </div>
         <div className="logo" style={logoStyle}>

styles/new-container.less

@@ -194,6 +194,11 @@
         font-size: 13px;
         display: none;
         padding: 10px;
+        p {
+          color: white;
+          padding-bottom: 7px;
+          border-bottom: 1px solid rgba(255,255,255,0.2);
+        }
         .tag-list {
           display: flex;
           flex-direction: row;