@media only screen and (min-width: 1200px) {
    .dialog-wide {
        width: 1000px; /* either % (e.g. 60%) or px (400px) */
    }
    
    .screen-main-banner {
    	width: 600px;
    }
    
    .screen-main-menu {
		width: 700px;
	}
}