.countdown_date {
/*    font-weight: bold;
    color: #333; */
}

/* 10분 이하 */
.countdown_date.warning {
    color: #e53935;
    animation: blink 1s infinite;
}

/* 종료 */
.countdown_date.expired {
    color: #999;
}

@keyframes blink {
    0%   { opacity: 1; }
    50%  { opacity: 0.5; }
    100% { opacity: 1; }
}