.book{font-family:sans-serif;text-align:center;-webkit-user-select:none;-moz-user-select:none;user-select:none}.book .demoPage .wrap{height:100%;width:100%}.book .demoPage{overflow:hidden}.book .demoPage img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover;-o-object-position:center;object-position:center}.tabs button{box-shadow:inset 0 100vw #fff;background-origin:border-box}.lectureSection .effect{animation:zoomInOut 3.5s linear}@keyframes zoomInOut{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}