style.css

/* ------------------- */
/* CSS Reset           */
/* ------------------- */

/* Box sizing rules */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Prevent font size inflation */
html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
}

/* Remove default margin in favour of better control in authored CSS */
body, h1, h2, h3, h4, p,
figure, blockquote, dl, dd {
    margin: 0;
}

/* Remove list styles on ul, ol elements with a list role, which suggests default styling will be removed */
ul[role='list'],
ol[role='list'] {
    list-style: none;
}

/* Set core body defaults */
body {
    min-height: 100vh;
    line-height: 1.5;
}

/* Set shorter line heights on headings and interactive elements */
h1, h2, h3, h4,
button, input, label {
    line-height: 1.1;
}

/* Balance text wrapping on headings */
h1, h2,
h3, h4 {
    text-wrap: balance;
}

/* A elements that don't have a class get default styles */
a:not([class]) {
    text-decoration-skip-ink: auto;
    color: currentColor;
}

/* Make images easier to work with */
img,
picture {
    max-width: 100%;
    display: block;
}

/* Inherit fonts for inputs and buttons */
input, button,
textarea, select {
    font: inherit;
}

/* Make sure textareas without a rows attribute are not tiny */
textarea:not([rows]) {
    min-height: 10em;
}

/* Anything that has been anchored to should have extra scroll margin */
:target {
    scroll-margin-block: 5ex;
}

/* ------------------- */
/* STYLING BEGINS      */
/* ------------------- */

/* Based on: SmolCSS - Smol Document Styles
https://SmolCSS.dev/#smol-document-styles */

body {
    display: flex;
    flex-direction: column;
    padding: 5vh clamp(1rem, 5vw, 3rem) 1rem;
    font-family: system-ui, sans-serif;
    line-height: 1.5;
    color: #222;
}

body > * {
    --layout-spacing: max(8vh, 3rem);
    --max-width: 70ch;
    width: min(100%, var(--max-width));
    margin-left: auto;
    margin-right: auto;
}

main {
    margin-top: var(--layout-spacing);
}

footer {
    margin-top: auto;
    padding-top: var(--layout-spacing);
}

footer p {
    border-top: 1px solid #ccc;
    padding-top: 0.25em;
    font-size: 0.9rem;
    color: #767676;
}

:is(h1, h2, h3) {
    line-height: 1.2;
}

:is(h2, h3):not(:first-child) {
    margin-top: 2em;
}

article * + * {
    margin-top: 1em;
}

a {
    color: navy;
    text-underline-offset: 0.15em;
}