.main{
        background-image: url(https://enquete.shinonome.ac.jp/wp-content/uploads/2022/05/2022授業_PC背景.jpg);
    }

.main main {
    background: url(https://enquete.shinonome.ac.jp/wp-content/uploads/2025/05/PCtitle_2025.png) center top no-repeat;
}

.container{
        background: #dec5e8;
    }

@media screen and (max-width: 768px) {
    .main{
        background-image: url(https://enquete.shinonome.ac.jp/wp-content/uploads/2022/05/2022授業_SP背景.jpg);
    }

.main main {
    background: url(https://enquete.shinonome.ac.jp/wp-content/uploads/2025/05/SPtitle_2025.png) center top no-repeat;
}

.container{
        background: #dec5e8;
    }

}