body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f8ff;
}

header {
    background-color: #4682b4;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

main {
    display: flex;
    margin: 20px;
}

.content {
    flex: 3;
    padding: 20px;
    background-color: #e0f7fa;
    margin-right: 20px;
}

.sidebar {
    flex: 1;
    padding: 20px;
    background-color: #b0e0e6;
}

.sidebar h3 {
    border-bottom: 2px solid #4682b4;
    padding-bottom: 10px;
}

footer {
    background-color: #4682b4;
    color: white;
    text-align: center;
    padding: 10px 0px;
    bottom: 0;
    width: 100%;
}