.chaptprev { background: rgba(0, 0, 0, 0.2) url(/images/btnBack.png) no-repeat 50% 50%; background-size: 24px; left: 0px; float: left; display: none;}  .chaptnext { background: rgba(0, 0, 0, 0.2) url(/images/btnNext.png) no-repeat 50% 50%; background-size: 24px; right: 0px; float: right; display: none;}  .btndown { position: fixed; bottom: 60px; height: 40px; width: 40px; z-index: 1000; float: right; display: block; background: url(/images/btnDown.png) 50% 50% / 25px no-repeat rgba(0, 0, 0, 0.2); display: none;}  .chaptnav { position: fixed; bottom: 15px; height: 40px; width: 30px; z-index: 1000; display: none;}  .play-button { position: fixed; bottom: 60px; height: 40px; width: 30px; z-index: 1000; right: 0px; float: right; } .play-icon { background: rgba(0, 0, 0, 0.2) url(/images/play-ico.png) no-repeat 50% 50%; background-size: 24px; } .pause-icon { background: rgba(0, 0, 0, 0.2) url(/images/pause-ico.png) no-repeat 50% 50%; background-size: 24px; }