:root {
	--preview-color: #eee;
}

#preview_container {
	display:none;
	position:absolute;
	left:340px;
	top:0;
	border:4px solid var(--preview-color);
	border-radius: 20px;
	box-shadow: 5px 5px 5px rgba(0,0,0,.1);
	width:200px;
	height:150px;
	background: var(--preview-color);
}

#preview_container:before {
    content: '';
    position: absolute;
    bottom: calc(50% - 20px);
    right: 100%;
    border: 20px solid transparent;
    border-right-color: var(--preview-color);
    pointer-events:none;
}

#preview_container img{
	border-radius: 16px;
	position:absolute;
	width:100%;
	height:100%;
	display:none;
}