.tab {
    display: flex;
    flex-wrap: wrap;
    margin-left: -20px;
    padding: 0;
    list-style: none;
    position: relative;
}

.tab > * {
    flex: none;
    padding-left: 20px;
    position: relative;
}

summary {
    display: list-item;
    color: #44434d;
    padding-top: 10px;
}
summary::marker {
    color: #1890ff;
    content: "*";
}

.main-content .tab li::before{
    content: "";
}

.main-content .tab-content li::before{
    content: "";
}

.tab > * > a {
    display: block;
    text-align: center;
    padding: 9px 20px;
    color: #999;
    border-bottom: 2px solid transparent;
    border-bottom-color: transparent;
    font-size: 12px;
    text-transform: uppercase;
    transition: color .1s ease-in-out;
    line-height: 20px;
}

.tab > .active > a {
    color:#222;
    border-color: #1e87f0;
}

.tab > li > a {
    text-decoration: none;
    cursor: pointer;
}

.tab-content {
    padding: 0;
}

.tab-content > li {
    display: none;
}
.tab-content > li.active {
    display: initial;
}