body{background-color:silver;display:flex;justify-content:center}.header{display:none}.main{width:700px;height:100%;background-color:#fff;position:relative;background:#fff url(../img/activity-wps/background.png?b501) top center no-repeat;position:relative}.main img{display:block;width:100%}.main img.bottom{margin-top:5%;width:80%;margin-left:10%}.main .btn{display:block;text-align:center;height:50px;line-height:50px;border-radius:25px;width:90%;position:absolute;bottom:10px;left:5%;font-size:24px;font-weight:700;color:#fff;cursor:pointer;background:linear-gradient(to right,#4889ff,#ff9ad1)}.main .btn:hover{text-decoration:none;background:linear-gradient(to right,#3d76dc,#fd44a9)}@media (max-width:768px){.main img.top{margin-top:0}.main img.bottom{margin-top:20%;width:95%;margin-left:2.5%}.main .btn{bottom:10%}}