body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f0f2f5;
}

#container {
    width: 1000px;
    margin: auto;
    background: white;
}

#topHeader {
    background: #222;
    color: white;
    text-align: right;
    padding: 10px;
}

#topHeader a {
    color: white;
    margin-left: 15px;
    text-decoration: none;
}

#header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

.logo img {
    height: 60px;
}

.banner img {
    height: 70px;
}

#nav {
    background: #444;
}

#nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

#nav li {
    padding: 12px 20px;
}

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

#nav a:hover {
    color: yellow;
}

#main {
    display: flex;
    gap: 20px;
    padding: 20px;
}

#sidebar {
    width: 25%;
    background: #f8f8f8;
    padding: 15px;
    border-radius: 8px;
}

#sidebar h3 {
    margin-top: 0;
}

#sidebar a {
    display: block;
    margin: 8px 0;
    text-decoration: none;
    color: #333;
}

#sidebar a:hover {
    color: red;
}

#content {
    width: 75%;
}

.item {
    background: #eee;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 12px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

#footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 15px;
}