body {
    margin: 0;
    font-family: Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

.sidebar {
    width: 220px;
    height: 100vh;
    background-color: #2f2f2f;
    position: fixed;
    top: 0;
    left: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto; 
    box-sizing: border-box;
}

.sidebar h2 {
    color: white;
    text-align: center;
    margin-bottom: 20px;
}

.sidebar button {
    padding: 10px;
    border: none;
    border-radius: 6px;
    background-color: #3a3a3a;
    color: #ddd;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar button:hover {
    background-color: #555;
    color: #fff;
}

.content {
    margin-left: 240px;
    padding: 40px;
}

.dark-mode {
    background-color: #121212;
    color: white;
}

.content input[type="number"], 
.content input[type="text"] {
    padding: 8px;
    margin-right: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.content button {
    padding: 8px 15px;
    margin-right: 5px;
    border: none;
    border-radius: 4px;
    background-color: #007BFF;
    color: white;
    cursor: pointer;
    transition: background 0.2s;
}

.content button:hover {
    background-color: #0056b3;
}

#gradeCalc {
    margin-top: 20px;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    border: 1px solid #eee;
    max-width: 300px;
}

.dark-mode #gradeCalc {
    background-color: #1e1e1e;
    border-color: #333;
}