body,dd,dl,dt,fieldset,h1,h2,h3,h4,h5,h6,html,legend,li,ol,p,ul{margin:0;padding:0}body,html{width:100%;height:100%;font-family:Microsoft YaHei}a{text-decoration:none!important;cursor:pointer}img{display:block}input{border:none;outline:none}ol,ul{list-style:none}#app{width:100%;min-width:1380px}.banxin{width:87.5rem;width:99.875rem;margin:auto}.bigImg{width:100%;height:25rem;background-image:url(../img/yuandi@2x.9d3de2c3.png);background-repeat:no-repeat;background-size:100% 100%;text-align:center;line-height:25rem;font-weight:800;font-size:3.125rem;color:#fff;margin-bottom:2.5rem}.course_center{display:flex;flex-wrap:wrap;min-height:300px}.message-logout{width:60rem!important}