style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100%;
    background-color: #121212;
    color: white;
    font-family: Roboto, sans-serif;
}

.content {
    margin-top: 1.5em;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

h2 {
    font-size: 1rem;
    margin-bottom: 1.5em;
    max-width: 60%;
    color: gray;
}

textarea {
    background-color: #222222;
    width: min(100%, 40em);
    height: 20rem;
    resize: none;
    color: #ffffff;
    padding: 1em;
    font-size: 1.5em;
}

input {
    margin: 3em;
    padding: 1em;
    background-color: #222222;
    color: white;
    outline: none;
    border-radius: 1rem;
    border-color: white;
}

input:disabled {
    cursor: not-allowed;
}

footer {
    position: absolute;
    bottom: 1rem;
    width: 100%;
    text-align: center;
    font-size: 0.8rem;
}