.hd-tel-text {
    text-align: center;
    margin-top: 20px;
}

.tel-title {
    font-family: "Klee One", YuMincho, "ヒラギノ明朝 ProN W3", "Hiragino Mincho ProN", "HG明朝E", "メイリオ", Meiryo, "ＭＳ Ｐ明朝", "ＭＳ 明朝", serif;
    font-size: 20px;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
    margin-bottom: 10px;
}

.tel-number a {
    font-size: 36px;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
    letter-spacing: 0.05em;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.7);
    /* ここが影の効果 */
}

.tel-number a:hover {
    text-decoration: underline;
}