* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

.upper_bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: red;
    padding: 10px;
    text-align: center;
    z-index: 1000;
}

.center-image {
    max-width: 100%;
    height: auto;
}

.video-container {
    position: relative;
    width: 100%;
    height: 93vh;
    margin-top: 60px;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.content {
    padding: 20px;
}

@media (max-width: 768px) {
    .upper-bar {
        padding: 15px;
    }

    .video-container {
        height: 80vh;
    }
}

@media (max-width: 480px) {
    .upper-bar {
        padding: 10px;
    }

    .video-container {
        height: 80vh;
    }
}