html, body {
    margin: 0;
    height: 100%;
    font-family: sans-serif;
}

.container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 30%;
    background-color: lightblue;
    border-right: 1px solid #ccc;
    overflow-y: auto;
    padding: 1em;
}

.preview {
    flex: 1;
    background-color: lightyellow;
    padding: 1em;
    overflow-y: auto;
}

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

li {
    margin-bottom: 0.5em;
}

a {
    text-decoration: none;
    color: #007bff;
    cursor: pointer;
}

a:hover {
    text-decoration: underline;
}