._ebookArea {
    padding: 100px 0;
}

._ebookArea .list {
    display: flex;
    justify-content: center;
    --gap: 72px;
    gap: var(--gap);
}

._ebookArea .list .item {
    width: calc(100% / 4 - (var(--gap) * 3 / 4) );
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(20/16*1em);
    text-align: center;
    line-height: 1.4;
}
._ebookArea .list .item .imgBx {
    position: relative;
    width: 100%;
    border: 1px solid #aaa;
}
._ebookArea .list .item .imgBx::after {
    content: '';
    display: block;
    padding-top: calc(710/500*100%);
}
._ebookArea .list .item .imgBx img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@media screen and (max-width: 1280px) {
    ._ebookArea {
        padding: 50px 0 80px;
    }
    ._ebookArea .list {
        --gap: 40px;
    }
}
@media screen and (max-width: 1024px) {
    ._ebookArea .list {
        --gap: 30px;
    }
}
@media screen and (max-width: 820px) {
    ._ebookArea .list {
        flex-wrap: wrap;
    }
    ._ebookArea .list .item {
        width: calc(100% / 2 - (var(--gap) * 1 / 2) );
    }
}
@media screen and (max-width: 500px) {
    ._ebookArea {
        padding: 30px 0 50px;
        font-size: clamp(14px, 1.2vw, 16px);
    }
}
@media screen and (max-width: 360px) {
    ._ebookArea .list .item {
        width: 100%;
    }
}