h3, h4 {
    color: #4F4F4F;
}

.container {
    max-width: 570px;
}

video {
    display: block;
    width: 100%;
    max-height: 500px;
    background-color: lightblue;
}

@media (max-width: 575.98px) {
    video {
        width: 100%;
        max-width: 100%;
    }
}