.artical-tab {
    width: 100%;
    position: relative;
}
.artical-tab:before {
    content: '';
    display: block;
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    border-bottom: 2px solid #e5e5e5;
}
.tab-item {
    padding: 12px 10px;
    font-size: 16px;
    position: relative;
    z-index: 99;
    cursor: pointer;
    font-weight: normal;
}
.tab-active.tab-item {
    border-bottom: 2px solid #1369bf;
}
.tab-active.tab-item:before {
    content: '';
    display: block;
    position: absolute;
    left: 50%;
    bottom: -13px;
    height: 0;
    width: 0;
    border-width: 6px;
    border-style: solid;
    border-color: #1369bf transparent transparent transparent;
    margin-left: -6px;
}