@import url('./teaching-courseware-view.css');
.teaching-reference-layer{position:absolute;inset:0;z-index:8;visibility:hidden;pointer-events:none;opacity:0;background:linear-gradient(135deg,#fff,#f4f8ff 65%,#f0f8fa)}
.teaching-reference-layer.is-visible{visibility:visible;pointer-events:auto;opacity:1}
.teaching-reference-layer iframe{display:block;width:1600px;height:900px;border:0;background:transparent;opacity:0}
.teaching-reference-layer.is-ready iframe{opacity:1}
.teaching-reference-slide .page-content{inset:0}