.container {
    display: flex;
}

nav {
    width: 200px;
    background-color: #f4f4f4;
    padding: 20px;
}

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

nav ul li {
    margin: 10px 0;
}

.content {
    flex: 1;
    padding: 20px;
}