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

body {
    height: 100%;
}

textarea {
    width: 100%;
    height: 100vh;
    padding: 0.25em;
    font-size: 18px;
    resize: none;
}

textarea:focus {
    outline: none;
}