<style type="text/css">
    .btn {
        display: block;
        background: none rgb(40, 60, 220);
        color: rgb(255, 255, 255);
        height: 36px;
        display: block;
        font-size: 15px;
    }
</style>
<input class="btn" type="submit" value="Width should shrink to fit" />