.contents {
    width: fit-content;
    height: calc(100vh - 60px);
    overflow: hidden;
}
.contents__scroll {
    display: block;
    height: calc(100vh - 80px);
    overflow-x: hidden;
    padding: 10px;
}

.contents__chapter {
    border-radius: 15px;
    /*height: 50px;*/
    width: 220px;
    position: relative;
    display: flex;
    align-items: center;
    user-select: none;
    padding-left: 20px;
    margin: 5px;
    cursor: pointer;
    padding: 15px;
}
.contents__chapter.sub {
    width: 205px;
    padding-left: 20px;
    margin-left: 20px;
}