#list_nav_box {
    margin-top: 30px;
    width: 100%;
    display: flex;
    justify-content: center;
}

#list_nav_box dl.list_nav {
    display: flex;
    justify-content: center;
    align-content: center;
}

#list_nav_box dl.list_nav dt {
    position: relative;
    width: 30px;
    height: 30px;
    margin: 1px;
    background-color: #2f3033;
    cursor: pointer;
    transition: all 0.5s ease;
}

#list_nav_box dl.list_nav dt a {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
    transition: all 0.5s ease;
}

#list_nav_box dl.list_nav dt span {
    position: absolute;
    width: 10px;
    height: 1px;
    margin-left: -5px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #999999;
}

#list_nav_box dl.list_nav dt span:nth-of-type(1) {
    margin-top: -3px;
    transform: rotate(-45deg);
}

#list_nav_box dl.list_nav dt span:nth-of-type(2) {
    margin-top: 3px;
    transform: rotate(45deg);
}

#list_nav_box dl.list_nav dt:nth-of-type(2) span {
    position: absolute;
    width: 10px;
    height: 1px;
    margin-left: -3px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #999999;
}

#list_nav_box dl.list_nav dt:nth-of-type(2) span:nth-of-type(1) {
    margin-top: -3px;
    transform: rotate(45deg);
}

#list_nav_box dl.list_nav dt:nth-of-type(2) span:nth-of-type(2) {
    margin-top: 3px;
    transform: rotate(-45deg);
}

#list_nav_box dl.list_nav dt:hover {
    background-color: #606266;
}

#list_nav_box dl.list_nav dd {
    position: relative;
    width: 30px;
    height: 30px;
    margin: 1px;
    font-size: 14px;
    font-weight: 300;
    line-height: 30px;
    color: #2f3033;
    text-align: center;
    border: 1px solid #e1e3e5;
    cursor: pointer;
    transition: all 0.5s ease;
}

#list_nav_box dl.list_nav dd:hover {
    background-color: #606266;
    color: #ffffff;
}


#list_nav_box dl.list_nav dd a {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
    transition: all 0.5s ease;
}