body{
    background: linear-gradient(to top,rgba(67, 46, 95, 0.897) ,rgba(200, 200, 200, 0.89));

    margin:0;
    padding:0;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size:cover;
    height: auto; min-height: 100vh; 
}
.List{
    display:flex;
    flex-direction: column;
    position: absolute;
    top: 10%;
    width: 100%;
    height: auto;
    text-align: center;
    text-decoration: none;
}
.section a{
    color: white;
    font-size: 24px;
    text-decoration: none;
}
.section{
    padding-top: 5%;
    padding-bottom: 5%;
    margin:0;
    width:100%;
    background: none;
    border: 2px solid rgba(114, 114, 114, 0.829); /* 幅2px、実線、赤色 */

}
.back a{
    padding-top: 5%;
    padding-bottom: 5%;
    margin:0;
    width:100%;
    background: none;
    border: 2px solid rgba(114, 114, 114, 0.829); /* 幅2px、実線、赤色 */
    color: blue;
    font-size: 26px;
}