:root {
    --background: lemonchiffon;
    --textColor: #333;
    --headingColor: #666;
    --infoBackground: yellow;
    --highlightColor: lime;
    --blendmode: normal;
}

body {
    background-color: var(--background);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    padding: 2rem;
    transition: all .4s;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--headingColor);
}

body.night {
    --background: rgb(17, 17, 41);
    --textColor: #fff;
    --headingColor: blue;
    --infoBackground: blue;
    --highlightColor: blue;
    --blendmode: hard-light;
}

.infobox {
    background-color: var(--infoBackground);
    padding: 1rem 2rem;
}

.content {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.content img {
    width: 100%;
    border-radius: 2rem;
    border: 2px solid var(--highlightColor);
    margin-bottom: 2rem;
    mix-blend-mode: var(--blendmode);
}

h1 {
    font-size: 4rem;
}

#text p,
.infobox p {
    color: var(--textColor);
    font-size: 1.25rem;
    line-height: 1.4;
    margin-bottom: 1.5rem;
}

#check {
    position: fixed;
    top: 1rem;
    left: 1rem;
}

#check label {
    color: var(--textColor)
}