.mean-calculator {
    max-width: 400px;
    background: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
}

.mean-calculator h3 {
    margin-bottom: 10px;
    color: #222;
}

.mean-calculator textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
    resize: none;
}

.mean-calculator button {
    margin-top: 10px;
    width: 100%;
    padding: 10px;
    background: #0073aa;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.mean-calculator button:hover {
    background: #005f8d;
}

.mean-result {
    margin-top: 12px;
    font-size: 16px;
    color: #000;
}