h3{color:#4ea6fe;font-size:16px;text-align:center;margin-top:50px}.btn{color:#399ffe;background:#fff;border:1px solid #399ffe;border-radius:20px;height:40px;line-height:40px;outline:none;cursor:pointer;margin:50px auto 0;display:block;width:170px;text-align:center}.main{width:100%;height:100%}.main img{width:50%;display:block;margin:50px auto 0}