body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header, #content {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

h1 {
    color: #007bff;
}

header {
    background-color: #333;
    height: 60px;
    flex-shrink: 0;
    color: white;
    display: flex;
    align-items: center;
    padding: 0 5%;
}

header h1 {
    color: white;
    font-size: 140%;
    margin: 0 20px;
}

#main-nav {
    background-color: #333;
    overflow: hidden;
}

#main-nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

#main-nav li {
    display: inline-block;
}

#main-nav li a {
    display: block;
    color: white;
    padding: 0 10px;
    height: 30px;
    line-height: 30px;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 0.9em;
}

#main-nav li a:hover {
    background-color: #575757;
}

#content {
    display: flex;
    flex-direction: row;
    flex-grow: 1;
    overflow: auto;
    padding-bottom: 20px;
}

main {
    float: left;
    width: 70%;
    box-sizing: border-box;
    padding-right: 20px;
}

aside {
    float: right;
    width: 30%;
    box-sizing: border-box;
    padding: 20px;
    background-color: #e9ecef;
}

main img {
    float: left;
    margin-right: 20px;
    margin-bottom: 10px;
    width: 200px;
    height: auto;
    border: 3px solid #ccc;
    border-radius: 8px;
}

p {
    margin-bottom: 1.2em;
    line-height: 1.6em;
}

footer {
    clear: both;
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
    font-size: 0.9em;
    margin-top: 20px;
    flex-shrink: 0;
}

#menu-button {
    display: none; 
    cursor: pointer;
    font-size: 1.5em;
    color: white;
    padding: 10px 15px;
    position: absolute;
    top: 0;
    right: 0;
    background-color: #333;
    height: 44px;
    line-height: 44px;
    text-align: center;
    z-index: 100;
}

@media all and (max-width: 800px) {
    header {
        height: 44px; 
    }

    #content {
        display: block; 
        padding: 10px;
    }

    main, aside {
        float: none; 
        width: 100%; 
        padding: 10px;
        margin: 0;
    }

    main img {
        width: 100%; 
        float: none;
        margin-right: 0;
    }
    
    #menu-button {
        display: block; 
        top: 0; 
        right: 0;
        height: 44px;
        padding-top: 0;
        padding-bottom: 0;
    }

    #main-nav {
        display: none; 
        height: auto; 
        position: absolute; 
        top: 44px; 
        width: 100%; 
        z-index: 99; 
    }

    #main-nav ul {
        flex-direction: column; 
    }
    
    #main-nav.open {
        display: block;
    }
}