body {
    font-family: Arial, sans-serif;
    line-height: 1.5;
    max-width: 64em;
    margin: 2em auto;
    padding: 0 1em;
}

h1 {
    letter-spacing: -3px;
    font-size: 3.23em;
    font-weight: bold;
    margin: 0;
}

textarea {
    width: 100%;
    min-height: 10em;
    font-family: Menlo, monospace;
}

.flex {
    display: flex;
    align-items: center;
}

#preview {
    display: flex;
    flex-wrap: wrap;
    align-items: start;
    margin-top: 0.5em;
}

#preview > img {
    width: var(--image-size);
    height: var(--image-size);
    margin: 4px;
    border: 0.5px solid lightgrey;
    cursor: pointer;
}

#preview > img.light {
    background-color: white;
}

#preview > img.dark {
    background-color: black;
}