body{background:#ddd;background-size:100%}.main{width:70%;height:350px;background:#fff;position:absolute;left:0;top:0;right:0;bottom:0;margin:100px auto 0 auto}.login_btn,.main{text-align:center}.login_btn{width:60%;height:40px;color:#fff;background-color:#1266f1;display:inline-block;font-weight:400;white-space:nowrap;vertical-align:middle;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;border:1px solid transparent;padding:.375rem .75rem;font-size:1rem;line-height:1.5;margin:0 auto}