body {
    margin: 0;
    background: #e9edf0
}

textarea {
    position: fixed;
    inset: 15px;
    padding: 20px;
    border: 0;
    outline: 0;
    resize: none;
    box-sizing: border-box;
    width: calc(100% - 30px);
    height: calc(100% - 30px);
    font-size: 100%
}

@media(prefers-color-scheme:dark) {
    body {
        background: #393939
    }

    textarea {
        background: #202020;
        color: #d4d4d4
    }
}