body {
    font-family: Arial, sans-serif;
    background-image: url("img/la\ luna.jpg");
    background-repeat: no-repeat;
    background-size: cover;
}
form {
    max-width: 400px;
    margin: auto;
    padding: 20px;
    border: 1px solid #f30606;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, .1);
}
textarea {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid #55a5f0;
    border-radius: 5px;
    box-sizing: border-box;
}
input[type="submit"] {
    background-color: #4CAF50;
    color: rgb(12, 12, 12);
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
input[type="submit"]:hover {
    background-color: #0ed017;
}