.timer-box {
    display: block;
    background-color: #28a745; /* verde Bootstrap */
    color: white;
    padding: 8px 12px;
    margin-top: 8px;
    margin-bottom: 0px;
    border-radius: 8px;
    font-weight: bold;
    font-family: monospace;
    font-size: 14px;
    text-align: center;
    min-width: 120px;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}