li {
    list-style: none;
}
ul.tab_nav {
    list-style-type: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    font-family: "Roboto", "微軟正黑體", "Helvetica Neue", Helvetica, sans-serif;
}
ul.tab_nav li {
    padding: 0.5em 1em;
    background: #32D9C3;
    margin: 0.2em;
    cursor: pointer;
    transition: all 0.5s;
    -moz-transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -o-transition: all 0.5s;
}
ul.tab_nav li.active {
    background: #19524b;
    color: #fff;
}
@media (prefers-color-scheme: dark) {
    ul.tab_nav li {
        background-color: #f3f3f3;
        color: #ccc;
    }
    ul.tab_nav li.active {
        background-color: #969696;
        color: #fff;
    }

}