body .custom-content-label {
    display: inline-block;
    padding: 15px;
    border: 1px solid #ddd;
    background-color: #f9f9f9;
    margin: 10px 0;
    text-align: center;
}

body .ad-container.left {
    text-align: left;
}

body .ad-container.center {
    text-align: center;
}

body .ad-container.right {
    text-align: right;
}

/* スマホ用のスタイル */
@media only screen and (max-width: 600px) {
    body .custom-content-label {
        min-width: 40px !important;
    }
}