the-glorious-startpage/css/centered-box.css

.centeredBar {
	width: 100%;
    height: auto;
    
    border: none;
    pointer-events: none;
    
    position: absolute;
	left: 50%;
	top: 50%;
	-webkit-transform: translate(-50%, -50%);
	transform: translate(-50%, -50%);
}

#centeredBox {
	opacity: 1;
	z-index: 2;
    transition: opacity var(--transition-speed),
    			z-index var(--transition-speed);
}

.hiddenBox {
	opacity: 0 !important;
	z-index: 0 !important;
}