/* Basic Reset */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

/* Navigation */
nav {
    background-color: darkred;
    text-align: center;
    padding: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}
.back-button {
    display: inline-block;
    padding: 8px 15px;
    margin: 10px;
    background-color: darkred;   /* button color */
    color: white;                /* text color */
    text-decoration: none;       /* remove underline */
    border-radius: 5px;
    font-weight: bold;
    font-size: 14px;
}

.back-button:hover {
    background-color: red;       /* hover effect */
}


/* Main Content */
main {
    padding: 20px;
}

img {
    max-width: 100%;
    height: auto;
}

/* Footer */
footer {
    background-color: darkgreen;
    color: white;
    text-align: center;
    padding: 10px;
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    nav a {
        display: block;
        margin: 10px 0;
    }

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