* {margin: 0;font-family: Arial;}
body {margin: 0;padding: 0;overflow-y: auto;}
body.grey {background: #f1f1f1;}

.desktop {width: 100%;margin-top: 45px;}
.desktop img {width: 100%;}
.mobile {width: 615px;margin: 0 auto;margin-top: 45px;}
.mobile img {width: 100%;}

.menu {position: fixed;top: 0;left: 0;width: 100%;}
.menu .title {width: 100%;position: absolute;text-align: center;padding-top: 11px;color: #327995;}
.menu .btn {padding: 13px 15px;background: #235e75;text-decoration: none;left: 0;top:0;color: #fff;opacity: 0.3;transition: all 0.3s ease;position: relative;z-index: 3;display: block;}
.menu .btn:hover {opacity: 1;}
.menu .btn.prev {float: left;}
.menu .btn.next {float: right;}