html {
    background: #ffffff;
}

.main {
    text-align: center;
}

.main>img:nth-child(1) {
    width: 912px;
    margin: 60px 0px;
}

.foot {
    margin: 0;
    position: absolute;
    width: 100%;
    min-width: 1028px;
}

.nav li:nth-child(4):after,
.nav li:nth-child(4):before {
    opacity: 1;
}