* {
    margin: 0;
    padding: 0;
}

.element-container {
    width: 100%;
    height: content-box;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container {
    width: 400px;
    height: auto;
}

video {
    width: 100%;
    height: auto;
}