.w_top_nav {
    height: 54px;
    padding: 13px 0;
}

.w_top_nav_box {
    width: 1200px;
    margin: 0 auto
}

.logo {
    display: block;
    float: left;
    height:54px;
}
    .logo img {
        height: 54px;
    }

    .w_left {
        float: left
    }

.w_right {
    float: right
}
.w_relative{
    position:relative
}
.w_top_nav {
    border-bottom: 1px solid #ddd
}
.w_top_nav_box ul {
    padding-left: 45px;
}

.w_top_nav_li {
    display: block;
    padding: 0 18px;
    text-align: center;
    line-height: 54px;
    font-size: 16px;
}

    .w_top_nav_li.w_this {
        color: #F95E00
    }

    .w_top_nav_li.w_this::after {
        content: '';
        display: block;
        position: absolute;
        width: 70%;
        left: 15%;
        height: 2px;
        background: #F95E00;
    }
    .w_top_nav_li:hover {
        color: #F95E00
    }

    .w_groups {
        padding: 7px;
    }

    .w_groups .w_groups_btn {
        display: block;
        float: left;
        width: 100px;
        height: 36px;
        background-color: #cd0100;
        border-radius: 4px;
        text-align: center;
        line-height: 36px;
        margin-left: 10px;
        color: white;
        font-size: 16px;
    }

        .w_groups .w_groups_btn:hover {
            color: white
        }