body {
    background-image: url('../img/login.webp');
    background-repeat: repeat-y;
    /* 縦方向のみ繰り返し */
    background-position: center top;
    /* 横方向は中央、縦は一番上を起点に配置 */
    background-size: 100% auto;
    /* ★横幅を画面100%に合わせ、縦は比率を保って自動調整 */
}

form {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    h1 {
        font-size: 24px;
        font-weight: normal;
        color: #fff;
        margin: 20px 0;
    }

    figure {
        width: 50%;
        max-width: 200px;

        img {
            width: 100%;
        }
    }

    input[type="email"],
    input[type="password"],
    button[type="submit"] {
        width: 80%;
        max-width: 430px;
        color: #fff;
    }

    input[type="email"],
    input[type="password"] {
        background-color: rgba(255, 255, 255, 0.3);
        border: solid 1px #fff;
        border-radius: 4px;
        font-size: 20px;
        padding: 20px;

        &::placeholder {
            color: #fff;
            opacity: 0.5;
        }
    }

    button[type="submit"] {
        margin: 30px 0;
        background-color: #8C1E23;
        border: none;
        cursor: pointer;
        padding: 10px;
    }

    label {
        display: flex;
        align-items: center;
        color: #fff;

        input[type="checkbox"] {
            margin-right: 10px;
            width: 20px;
            height: 20px;
        }
    }
}