.countdown-box {
    background: #FFF8E7;
    color: #A31D1D;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid #A31D1D;
    margin: 20px 0;
    font-size: 16px;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.countdown-timer {
    font-size: 20px;
    color: #FF7E7E;
    margin-top: 10px;
}
<div class="countdown-box">
    ⏳ العرض ينتهي خلال:
    <div class="countdown-timer">00:15:30</div>
</div>