js-keyboard/main.css

body {
    font-size: medium;
    background-color: #e5e5e5;
}

.wrapper {
    padding: 20px;
    margin: 5px 0;
    background-color: #222222;
}

textarea {
    font-size: 20px;
    width: 100%;
}

button {
    width: 50px;
}