.fixed {
    position: fixed;
    top: 0;
    bottom: 0;
}

.left {
    left: 0;
    width: 20%;
    overflow-y: scroll;
}

.right {
    right: 0;
    width: 80%;
}
@media all and (max-width: $width-xl) {
    .left {
        width: 25%;
    }

    .right {
        width: 75%;
    }
}
@media all and (max-width: $width-lg) {
    .left {
        width: 30%;
    }

    .right {
        width: 70%;
    }
}
@media all and (max-width: $width-md) {
    .fixed {
        position: relative;
        width: 100%;
    }
}