Enhance shortcode menu with Thickbox prompt

assets/css/menu.css

@@ -74,14 +74,35 @@
 	text-align: center;
 }
 
-.wp-media-buttons .add_sportspress span.wp-media-buttons-icon:before {
-	font: normal 20px/1 sportspress, dashicons;
+/* Prefs */
+.sp-prefs .button {
+	margin: 0 3px 4px 0;
+	padding: 0 7px 1px 5px;
+}
+
+.sp-prefs .button input[type=checkbox] {
+	background: transparent;
+	border: none;
+	-webkit-box-shadow: none;
+	box-shadow: none;
+}
+
+.sp-prefs .button input[type=checkbox]:not(:checked):before {
+	float: left;
+	display: inline-block;
+	vertical-align: middle;
+	width: 16px;
+	font: 400 21px/1 dashicons;
 	speak: none;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-	content: '\f111';
+	content: '\f335';
+	margin: -3px 0 0 -4px;
+	color: #a00;
 }
 
+/* TinyMCE */
+
 i.mce-i-sp_shortcodes_button:before, span.mce_sp_shortcodes_button:before {
 	font-family: 'sportspress';
 	speak: none;