.tabs {
    display: flex;
}

.tab {
    flex-shrink: 0;
    padding: 10px;
    border-right: 1px solid #bbb;
    cursor: pointer;
    user-select: none;
}

.tab[selected] {
    background-color: #bbb;
}

.tab:hover {
    background-color: #999;
}

.tab:active {
    background-color: #666;
}