.nav {
    overflow: hidden;
}
.sk_list {
    float: left;
}
.sk_list ul li {
    float: left;
}
.sk_list ul li a {
    display: block;
    padding: 0 30px;
    color: #000;
    font-size: 16px;
    font-weight: bold;
    line-height: 47px;
}
.sk_con {
    float: left;
}
.sk_con ul li {
    float: left;
}
.sk_con ul li a {
    display: block;
    padding: 0 20px;
    font-size: 14px;
    line-height: 49px;
}
.sk_con ul li:last-child a::after {
    content: '\e91e';
    font-family: icomoon;
}
.sk_bd ul li {
    float: left;
    overflow: hidden;
    margin-right: 13px;
    width: 290px;
    height: 460px;
    border: 1px solid transparent;
}
.sk_bd ul li:nth-child(4n) {
    margin-right: 0;
}
.sk_bd ul li:hover {
    border: 1px solid #c81523;
}
.logo {
    position: relative;
}
.logo h1 a::after {
    content: '';
    position: absolute;
    top: 25px;
    right: -70px;
    width: 56px;
    height: 26px;
    background: url(../images/sk.png);
}