:root {
    --container-max-width-sm: 540px;
    --container-max-width-md: 720px;
    --container-max-width-lg: 960px;
    --container-max-width-xl: 1140px;
    --container-max-width-xxl: 1320px;
}

.custom-container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    padding-right: 15px;
    padding-left: 15px;
}

@media (min-width: 576px) {
    .custom-container {
        max-width: var(--container-max-width-sm);
    }
}

@media (min-width: 768px) {
    .custom-container {
        max-width: var(--container-max-width-md);
    }
}

@media (min-width: 992px) {
    .custom-container {
        max-width: var(--container-max-width-lg);
    }
}

@media (min-width: 1200px) {
    .custom-container {
        max-width: var(--container-max-width-xl);
    }
}

@media (min-width: 1400px) {
    .custom-container {
        max-width: var(--container-max-width-xxl);
    }
}


.countdown-container {
    display: block;
    max-width: 480px;
    margin: 0 auto;
}
.countdown-col {
    background-color: #007bff;
    color: #FFFFFF;
    border-radius: 8px;
    padding: 10px;
    margin: 10px;
}

.countdown-col h4 {
    color: #FFFFFF;
    font-size: 55px;
    font-weight: 600;
    font-family: Arial, Helvetica, sans-serif;
}

@media (max-width: 900px) {
    .countdown-col {
        font-size: 35px;
        margin: 10px;
    }
    .countdown-col h4 {
        font-size: 35px;
    }
}

.countdown-col p {
    color: #FFFFFF;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
}

.countdown-col:nth-child(2) {
    background-color: #0056b3;
}
.countdown-col:nth-child(3) {
    background-color: #003f7f;
}
.countdown-col:nth-child(4) {
    background-color: #00264d;
}