html {
    font-size: 16px;
    font-family: Arial, Helvetica, sans-serif;
    background: #ffd973;
}

body {
    margin: 0;
    background-attachment: fixed;
    overflow-y: scroll;
    /* 縦スクロールを許可 */
}

.content {
    margin: 20px auto 100px;
    text-align: center;
    width: 80%;
    max-height: 80vh;
}

.center-image {
    width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

.center-btn {
    margin-top: 10px;
}

.center-btn a {
    background-color: #ff4f00;
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 25px;
    font-weight: 600;
}

.over-content {
    width: 90%;
    max-width: 600px;
    margin: 5vh auto 100vh;
}

.text-box {
    padding: 0.2em 0.5em;
    color: #565656;
    background: white;
    box-shadow: 0px 0px 0px 10px #faefc9;
    border: dashed 2px #ffd973;
    border-radius: 8px;
    justify-content: space-between;
    text-align: center;
}

.text-box img {
    max-height: 90vh;
    width: 100%;
    max-width: 400px;
}

.text {
    margin: 0;
    line-height: 3;
    flex-grow: 1;
}