[fix] iOS browser css :active pseudo styles

iOS is a bit strange on that. You can use ontouchstart as follows:

<button class="button" ontouchstart>test</button>

Or the pseudo :target (works for <a> tags)

.button:target { 
     background-color: red; box-shadow: 0 5px #666; transform: 
     translateY(4px); 
 }