example.scss

dialog {
	$dialog-z-index: 2;
	$outline-color: $brand-success;
	$dialog-heigh: 200px;
	$dialog-shift-top: calc(50% - #{$dialog-heigh / 2});
	$char-multiplication-sign: '\00D7';
	$bg-overlay-color: rgba(17, 13, 13, 0.5);
	$brand-success: blue;
	$body-bg: #fff;
	$base-text-color: #fff;

	display: block;
	position: fixed;
	padding: 0;
	top: $dialog-shift-top;
	visibility: hidden;
	opacity: 0;
	transition: opacity 0.5s;

	&[open] {
		visibility: visible;
		opacity: 1;
		z-index: $dialog-z-index + 1;
	}

	&>div {
		background: inherit;
		position: relative;
		padding: 1rem;
		min-height: $dialog-heigh;
		z-index: $dialog-z-index + 2;
	}

	&>button {
		position: fixed;
		text-decoration: none;
		top: 0;
		left: 0;
		margin: 0;
		height: 100%;
		width: 100%;
		border: none;
		cursor: pointer;
		padding: 1rem;
		background: $bg-overlay-color;
		z-index: $dialog-z-index;
		font-size: 0;
		color: transparent;
	}

	&>button:focus::before {
		outline: none;
		box-shadow: 0 0 0.2em 0.3em $outline-color;
	}

	&>button::before {
		font-family: Verdana, Geneva, sans-serif;
		content: $char-multiplication-sign;
		font-weight: bold;
		background: $body-bg;
		border: 2px solid $bg-overlay-color;
		position: absolute;
		top: 1.5rem;
		right: 1.5rem;
		display: block;
		color: $base-text-color;
		font-size: 1.2rem;
		width: 2rem;
		height: 2rem;
		border-radius: 50%;
		line-height: 1.6rem;
		text-align: center;
		transition: border-color 0.5s, color 0.5s, box-shadow 0.1s;
	} // &>button::before

	&>button:focus::before,
	&>button:hover::before {
		border-color: $body-bg;
		color: $brand-success;
	} //&>button:hover::before

} // dialog