index.scss

html {
    box-sizing: border-box;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

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

// Remove default margin
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;
}

// Reset margin and padding on lists
ul,
ol {
    margin-top: 0;
    margin-bottom: 0;
    padding-left: 0;

    &:not([class]) {
        padding-left: 1.25em;
    }
}

// Bullets and numbering match text color
li::marker {
    color: currentColor;
}

// Set core root defaults
html:focus-within {
    scroll-behavior: smooth;
}

// Set core body defaults
body {
    min-height: 100vh;
    text-rendering: optimizeSpeed;

    // This CSS disables the default “subpixel antialiasing” on macOS (only macOS, not iOS and no other OS) that is
    // only enabled in web browsers. Text is rendered visually lighter as a result and the result is closer in weight
    // to all other operating systems.
    -webkit-font-smoothing: antialiased;
}

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

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

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

// Sensible table basics
table {
    width: 100%;
    border: 0;
    border-collapse: collapse;
    border-spacing: 0;
}

// Hidden means hidden
[hidden] {
    display: none !important;
}

// Remove all animations, transitions and smooth scroll for people that prefer not to see them
@media (prefers-reduced-motion: reduce) {
    html:focus-within {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
    }
}