From Josh Comeau at https://www.joshwcomeau.com/css/custom-css-reset/

css-resets.css

/*
	1. Use a more-intuitive box-sizing model.
*/

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

/*
	2. Remove default margin
*/

* {
	margin: 0;
	padding: 0;
}

/*
	3. Allow percentage-based heights in the application
*/

html,
body {
	height: 100%;
}

/*
	Typographic tweaks!
	4. Add accessible line-height
	5. Improve text rendering
*/

body {
	line-height: 1.5;
	-webkit-font-smoothing: antialiased;
}

/*
	6. Improve media defaults
*/

img,
picture,
video,
canvas,
svg {
	display: block;
	max-width: 100%;
}

/*
	7. Remove built-in form typography styles
*/

input,
button,
textarea,
select {
	font: inherit;
}

/*
	8. Avoid text overflows
*/

p,
h1,
h2,
h3,
h4,
h5,
h6 {
	overflow-wrap: break-word;
}

/*
	9. Create a root stacking context
*/

#root {
	isolation: isolate;
}