scratchpad/style.css

body {
    margin: 0;
    padding: 0;
    background-color: #111;
    color: #eee;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#input {
    background-color: transparent;
    color: inherit;
    font-size: 1rem;
    position: absolute;
    display: block;
    box-sizing: border-box;
    line-height: 150%;
    width: 100%;
    height: calc(100% - 2rem);
    bottom: 0;
    padding: 1rem;
    border-style: none;
    resize: none;
}

#input:focus {
    outline: 0;
}

#status {
    background-color: #333;
    color: #fff;
    position: absolute;
    top: 0;
    width: 100%;
    box-sizing: border-box;
    padding: 0 1rem;
    line-height: 2rem;
    border-bottom: 1px solid #666;
}

@media (prefers-color-scheme: light) {
    body {
        background-color: #eee;
        color: #111;
    }

    #status {
        background-color: #ccc;
        color: #000;
        border-bottom: 1px solid #999;
    }
}