html, body {
    height: 100%; /* Ensure html and body take full height */
    margin: 0; /* Remove default margins */
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column; /* Stack elements vertically */
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 10px 0;
    text-align: center;
    width: 100%; /* Full width */
}

main {
    flex: 1; /* Allow main content to grow */
    display: flex;
    flex-direction: column;
    align-items: center; /* Center items horizontally */
}

.video-gallery {
    display: block; 
    margin: 20px;
    width: 100%; /* Full width */
    height: 100%; /* Full Height */
    max-width: 800px; /* Maximum width */
}

.video {
    width: 100%; 
    margin: 15px 0; 
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

iframe {
    width: 100%;
    height: 400px; 
    border: none;
}

.alert {
    background-color: #f9c2c2;
    color: #850101;
    text-align: center;
    padding: 10px;
    margin: 20px;
    border: 1px solid #850101;
    border-radius: 5px;
    max-width: 800px; /* Keep alert message consistent */
}

footer {
    text-align: center;
    padding: 15px 0;
    background-color: #f1f1f1;
    width: 100%; /* Full width */
}