.index {
    /* position: relative; */
    height: 100vh;
    /* margin-top: 74px; */
}

.index .left {
    position: fixed;
    width: 268px;
    height: 100%;
    /* overflow: auto; */
    top: 80px;
    left: 0;
    background-color: var(--color-light);
}

.index .right {
    margin-left: 300px;
    box-sizing: border-box;
    height: 100%;
}