p5.js-web-editor/styles/components/_preferences.scss

.preferences {
	background-color: $preferences-background-color;
	display: none;
	&--selected {
		display: flex;
	}
}

.preferences__exit-button {
	background-color: $light-button-background-color;
	color: $light-button-color;
	display: inline-block;
	height: #{44 / $base-font-size}rem;
	width: #{44 / $base-font-size}rem;
	text-align: center;
	line-height: #{50 / $base-font-size}rem;
	cursor: pointer;
	border: none;
	outline: none;
	margin-left: auto;
}