Add Markdown preview for textarea, see #407

assets/css/form.css

@@ -49,7 +49,7 @@ input[type="number"] {
 textarea {
     border: 1px solid #ccc;
     width: 400px;
-    max-width: 95%;
+    max-width: 99%;
     height: 200px;
     font-size: 1.0em;
     font-family: sans-serif;
@@ -140,7 +140,6 @@ input.form-input-large {
 
 .form-column {
     float: left;
-    margin-bottom: 60px;
     padding-right: 50px;
 }
 
@@ -166,4 +165,48 @@ input.form-input-large {
 
 .form-checkbox-group label {
     display: inline;
-}
+}
+
+/* preview tabs */
+.form-tabs {
+    width: 100%;
+    max-width: 800px;
+}
+
+.form-tabs-nav {
+    margin-bottom: 8px;
+}
+
+.form-tabs-nav li {
+    margin-left: 0;
+    display: inline;
+}
+
+.form-tab {
+    margin-right: 20px;
+}
+
+.form-tab a {
+    color: #ccc;
+    font-weight: bold;
+    text-decoration: none;
+}
+
+.form-tab a:focus,
+.form-tab a:hover {
+    color: #000;
+}
+
+.form-tab-selected a {
+    color: #333;
+}
+
+.preview-area {
+    border: 1px dashed #000;
+    padding-top: 5px;
+    padding-left: 5px;
+    padding-right: 5px;
+    margin-bottom: 5px;
+    display: none;
+    overflow: auto;
+}