/* 背景画像 */
body {
    min-height: 100vh;
    box-sizing: border-box;
    position: relative;
}

#bg-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;

    background-image: url("kamiazimi-180.jpg");
    background-attachment: scroll;
    background-size: cover;
    background-position: bottom;

    z-index: -2;
}

#bg-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;

    background-color: rgba(255, 252, 249, 0.75);

    z-index: -1;
}