.look-frame
{
    /* ensure that fieldset consumes entire height of parent */
    height: 100%;

    /* frames can overlay other controls and don't support any events
       so let all the events through (like it does not exist) 
    */
    pointer-events: none;
}
     
.look-frame fieldset
{
    /* ensure that fieldset consumes entire height of parent */
    height: 100%;
}