* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    background-color: #000000;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 1000px;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    background: #000;
}

@media (max-width: 768px) {
    .video-container {
        width: 100%;
        height: 100%;
        padding-bottom: 0;
    }
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}