body {
    margin: 0;
    font-family: "Trebuchet MS", Verdana, sans-serif;
    background: #f2f2f2;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
}

header {
    width: 100%;
    padding: 15px;
    background: #007c11;
    color: #fff;
    text-align: center;
    font-weight: bold;
    font-size: 22px;
    letter-spacing: 1px;
}

.container {
    margin-top: 20px;
    text-align: center;
}

input {
    margin: 5px;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
}

button {
    margin: 5px;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    background: #1982c4;
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s ease;
}

button:hover {
    background: #1271a8;
}

canvas {
    display: block;
    margin: 15px auto;
    max-width: 100%;
    border-radius: 6px;
    background: #000;
}