/* 只有英文版才會變3個 */
.nav {
    float: left;
    /* width: 25%; */
    width: calc(100% / 3);
    box-sizing: border-box;
    padding: 0px 5px;
    position: relative;
}

/* 控制英文版版頭nav按鈕斜線 */
.nav:nth-child(2) > a::before {
    content: '/';
    position: absolute;
    top: 0px;
    left: -7px;
    color: #bdb8b8;
}