Fix css bug when precompiling assets

app/assets/stylesheets/widget.css

@@ -53,12 +53,12 @@
 	display:inline-block;
 	margin-right: 5px;
 	opacity: 0.8;
-	filter: alpha(opacity:80);
+	filter: alpha(opacity=80);
 	color: #FFF;
 }
 .action:hover {
 	opacity: 1;
-	filter: alpha(opacity:100);
+	filter: alpha(opacity=100);
 	cursor: pointer;
 	color: #FFF;
 	text-decoration: none;
@@ -97,7 +97,7 @@
 	opacity:.0;
     font-size: 60px;
     left: -595px/9;
-	filter: alpha(opacity: 0);
+	filter: alpha(opacity=0);
 	outline: none;
 }
 .file-upload .upload:focus {