html,body{height:100%}body{margin:0;font:16px sans-serif}.container{position:relative;display:flex;height:100%;flex-direction:column}.label{position:absolute;display:flex;align-items:center;justify-content:center;left:0;top:0;right:0;bottom:0;padding:20px;margin:20px;border:3px dashed #aaa;border-radius:10px;font-size:120%}.container_hidden .label{display:none}.container_drag .label{display:flex;border-color:#444}.preview-item{display:inline-block;vertical-align:bottom;margin:10px}.preview-item__label{text-align:center}