body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}


header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
}


.container {
    display: flex;
    flex-wrap: wrap;
    margin: 20px;
}


.sidebar {
    flex: 1 1 30%;
    background-color: #f4f4f4;
    padding: 20px;
    box-sizing: border-box;
    margin: 10px;
}


.content {
    flex: 1 1 65%;
    background-color: #f4f4f4;
    padding: 20px;
    box-sizing: border-box;
    margin: 10px;
}


.responsive-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
}


footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
}


@media (max-width: 768px) {
    .container {
        flex-direction: column; 
    }
    .sidebar, .content {
        flex: 1 1 100%; 
    }
}

@media (max-width: 480px) {
    header, footer {
        padding: 15px;
    }
    .sidebar, .content {
        padding: 15px;
    }
    .responsive-image {
        border-radius: 5px; 
    }
}