body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f4f4f4;
    background-image: url('20240213_200223.jpg');
    background-size: cover;
    background-attachment: fixed;
}

header {
    background-color: rgba(51, 51, 51, 0.8);
    color: #fff;
    padding: 10px 0;
    width: 100%;
    text-align: center;
}

main {
    max-width: 800px;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
    background-color: rgba(255, 255, 255, 0.8);
    margin: 20px 0;
}

section {
    margin-bottom: 20px;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
}

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

.btn-container {
    text-align: right;
    margin: 20px 0;
}

.btn-back {
    display: inline-block;
    padding: 10px 20px;
    font-size: 16px;
    color: white;
    background-color: #216504;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.btn-back:hover {
    background-color: #2a720d;
}

footer {
    background-color: rgba(51, 51, 51, 0.8);
    color: #fff;
    padding: 10px 0;
    width: 100%;
    text-align: center;
    position: fixed;
    bottom: 0;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    main {
        padding: 10px;
    }
}