Customize a button in jquerymobile?
===

thats my button:

		<p><a href="#test1" data-role="button" class="testbutton1">Test 1</a></p>	

and thats the css spezification:

    .testbutton1 {
    	/* Fallback for web browsers that don't support RGBa */
    	background-color: rgb(0, 0, 0);
    	/* RGBa with 0.6 opacity */
    	background-color: rgba(0, 0, 0, 0.6);
    	/* For IE 5.5 - 7*/
    	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000);
    	/* For IE 8*/
    	-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000)";	
    }


When I load the html side. nothing happens?
Whats my mistake?

thx in advance