.model-page{width:100vw;height:100vh}.model-page .back{cursor:pointer;position:fixed;bottom:40px;left:80px;width:60px;height:50px;background-image:url(../img/back.6d84a5c3.png);background-repeat:no-repeat;background-position:50%;background-size:100% 100%}.model-page .model-iframe{width:100%;height:100%}