I have capsuled my problem to this. The centering works in firefox but not in chrome. Any ideas?
.center_align
{
text-align: center;
width: 100%;
}<html>
<head>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
</head>
<body>
<select class="form-control center_align">
<option value="0"> - Välj -</option>
<option value="1" selected=""> Kategorier valda</option>
</select>
</body>
</html>