style.css

body {
    background-color: #222;
    color: #ddd;
    font-family: Arial, sans-serif;
}

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

.sidebar {
    flex: 1;
    padding: 20px;
    background-color: #333;
}

.sidebar h2 {
    margin-top: 0;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.main-content {
    flex: 3;
    padding: 20px;
}

.main-content h2 {
    margin-top: 0;
}

form {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
}

input[type=text], textarea {
    width: 100%;
    padding: 10px;
    border-radius: 5px;
    border: none;
    background-color: #444;
    color: #ddd;
    margin-bottom: 10px;
}

input[type=submit] {
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
}

input[type=submit]:hover {
    background-color: #3e8e41;
}

#note-preview {
    border: 1px solid #ddd;
    padding: 10px;
    background-color: #444;
    max-height: 300px;
    overflow-y: auto;
}

#note-preview p {
    margin-top: 0;
    margin-bottom: 10px;
}

.folder {
    font-weight: bold;
    cursor: pointer;
}

.folder ul {
    list-style: none;
    padding-left: 20px;
    margin: 0;
}

.folder ul li {
    margin-bottom: 5px;
}