body,
html {
    font-family: Helvetica, Arial, sans-serif;
    font-size: 16px;
}

body {
    margin: auto;
    padding: 1rem;
    max-width: 1024px;
    background-color: aliceblue;
}

.link-back {
    float: right;
    text-decoration: none;
}

.link-back::before {
    color: darkcyan;
    content: "↩ ";
}

p {
    padding-top: 0.3rem;
    padding-bottom: 0.3rem;
}

ul {
    list-style-type: "▶ ";
}

li::marker {
    color: darkcyan;
}

h2 {
    margin-left: 0.5rem;
}

h3 {
    margin-left: 1rem;
}

h4 {
    margin-left: 1.5rem;
}

img {
    min-width: 240px;
    margin: 0 auto;
}

@media screen and (min-width: 600px) {
    img {
        max-width: 600px;
    }
}