body {
    font-family: Arial, sans-serif;
    background-color: #222222;
    color: #ffffff;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #333333;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    width: 80%;
    max-width: 600px;
}

h1 {
    text-align: center;
    color: #f0f0f0;
}

#input-section {
    margin-bottom: 20px;
}

#data-input {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    font-size: 14px;
    background-color: #444444;
    border: 1px solid #666666;
    color: #ffffff;
    border-radius: 4px;
    resize: vertical; /* Allow vertical resizing of textarea */
}

#data-input::placeholder {
    color: #999999;
}

button {
    background-color: #1e90ff; /* Dark blue */
    color: #ffffff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #007bff; /* Lighter blue on hover */
}

#output-section {
    margin-top: 20px;
}

#chart-container {
    margin-top: 20px;
    background-color: #333333; /* Dark background for chart container */
    padding: 10px;
    border-radius: 8px;
}

canvas {
    background-color: #222222; /* Dark background for canvas */
}