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

.container {
    display: flex;
    flex-direction: row;
}

#sidebar {
    width: 250px;
    padding: 20px;
    background-color: #f4f4f4;
}

#main {
    flex-grow: 1;
    padding: 20px;
}

h2, h1 {
    margin: 0;
}

h3 a {
    text-decoration: none;
    color: blue;
}

h3 a:hover {
    text-decoration: underline;
}

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

li {
    margin-bottom: 10px;
}

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