index.css

body {
	margin: 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
		"Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
		sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

code {
	font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
		monospace;
}

html,
body,
#root {
	height: 100%;
	position: relative;
}

[contenteditable="true"]:focus {
	outline: none;
}

[contenteditable="true"]:empty:focus:before {
	content: attr(data-placeholder);
	color: grey;
}