.sub_nav_wrap {
    position: fixed;
    top: 15%;
    width: 100%;
    height: 64px;
    background-color: #112535;
    z-index: 99;
}

.sn_container {
    width: 80%;
    height: 100%;
    margin-left: 10%;
}

.t1 {
    margin-left: 11%;
}

.t2 {
    margin-left: 30px;
}

.t3 {
    margin-left: 30px;
}

.t4 {
    margin-left: 30px;
}

.tab_block {
    position: relative;
    width: auto;
    height: 100%;
    font-size: 16px;
    cursor: pointer;
}

.tb_a > span {
    display: inline-block;
    width: auto;
    line-height: 64px;
    text-align: center;
    color: #f0f0f0;
}

.tb_a {
    width: auto;
    height: 100%;
    text-align: center;
}

.children_nav {
    display: none;
    position: absolute;
    top: 64px;
    width: 200px;
    height: auto;
    background-color: #FFFFFF;
    border-radius: 0 0 5px 5px;
    -webkit-box-shadow: 0 12px 10px 0 rgb(0 0 0 / 10%);
    box-shadow: 0 12px 10px 0 rgb(0 0 0 / 10%);
}

.children_nav span {
    display: inline-block;
    width: 180px;
    line-height: 50px;
    text-align: left;
    margin-left: 20px;
    color: #000000;
}

.children_nav span:hover {
    color: #ed6827;
}

.tab_block:before {
    content: "";
    display: block;
    width: 0;
    height: 3px;
    background: #ed6827;
    margin-left: auto;
    margin-right: auto;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    -webkit-transition: all .3s;
    transition: all .3s;
}

.tab_block:after {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 1px rgba(255, 255, 255, 0.4) solid;
    border-bottom: 1px rgba(255, 255, 255, 0.4) solid;
    vertical-align: middle;
    margin-top: -3px;
    margin-left: 5px;
    -webkit-transform: rotate(
            45deg
    );
    transform: rotate(
            45deg
    );
    -webkit-transition: all .3s;
    transition: all .3s;
}

.tab_block:hover.tab_block:before {
    width: 100%;
}d

.tab_block:hover.tab_block:after {
    border-right: 1px rgba(255, 255, 255, 0.8) solid;
    border-bottom: 1px rgba(255, 255, 255, 0.8) solid;
    -webkit-transform: rotate(
            225deg
    );
    transform: rotate(
            225deg
    );
}

.tab_block:hover .children_nav {
    display: block;
}