body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to right, #ff0000, #ff7f00, #ffff00, #00ff00, #0000ff, #4b0082, #9400d3);
    /* Degradado de colores estilo arcoíris */
}

.container {
    width: 80%;
    margin: 50px auto;
    background-color: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    font-size: 36px;
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 400px;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    resize: none;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}