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CSS

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HTML 

              
                <button class='trigger-button' onClick='document.getElementById("dialog").showModal();'>
	<span>
		Open Dialog
		<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
			<path d="M9.375 3a1.875 1.875 0 0 0 0 3.75h1.875v4.5H3.375A1.875 1.875 0 0 1 1.5 9.375v-.75c0-1.036.84-1.875 1.875-1.875h3.193A3.375 3.375 0 0 1 12 2.753a3.375 3.375 0 0 1 5.432 3.997h3.943c1.035 0 1.875.84 1.875 1.875v.75c0 1.036-.84 1.875-1.875 1.875H12.75v-4.5h1.875a1.875 1.875 0 1 0-1.875-1.875V6.75h-1.5V4.875C11.25 3.839 10.41 3 9.375 3ZM11.25 12.75H3v6.75a2.25 2.25 0 0 0 2.25 2.25h6v-9ZM12.75 12.75v9h6.75a2.25 2.25 0 0 0 2.25-2.25v-6.75h-9Z" />
		</svg>
	</span>
</button>

<dialog id="dialog">
		<form method="dialog">
			<button class='close-button'>
				Close
				<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class='icon'>
					<path fill-rule="evenodd" d="M12 2.25c-5.385 0-9.75 4.365-9.75 9.75s4.365 9.75 9.75 9.75 9.75-4.365 9.75-9.75S17.385 2.25 12 2.25Zm-1.72 6.97a.75.75 0 1 0-1.06 1.06L10.94 12l-1.72 1.72a.75.75 0 1 0 1.06 1.06L12 13.06l1.72 1.72a.75.75 0 1 0 1.06-1.06L13.06 12l1.72-1.72a.75.75 0 1 0-1.06-1.06L12 10.94l-1.72-1.72Z" clip-rule="evenodd" />
				</svg>
			</button>
		</form>
		<div class='dialog-wrapper'>
			<h2>Dialog Light Dismiss</h2>
			<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eu ligula elit. Fusce et metus massa. Fusce scelerisque lacus erat, et mollis ante tincidunt at. Etiam sed porta lacus, et aliquam dolor. Ut euismod augue eu iaculis condimentum. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aliquam elementum sapien nec justo congue, vitae pharetra ipsum posuere. Proin commodo arcu quis enim ultrices tempus. Phasellus tellus mauris, sagittis in ex eu, elementum euismod libero.</p>
		</div>
	</div>
</dialog>
!

CSS 

              
                :root,::backdrop {
	--color: #333;
	--background: #fefefe;
	--focus: #ff0078;
	--grid-size: 50px;
	--grid-width: 0.9px;
}

::backdrop {
	background: color-mix(in lch, var(--color), transparent 60%);
}

.icon {
	width: 1em;
	height: 1em;
	transform: scale(1.2);
}

body {
	color: var(--color);
	background: var(--background);
	font-family: system-ui, sans-serif;
	&::before {
		content: '';
		inset: 0;
		position: fixed;
		background-image: repeating-linear-gradient(transparent, transparent var(--grid-size),color-mix(in lch, var(--color), transparent 80%) 0, color-mix(in lch, var(--color), transparent 80%) calc(var(--grid-size) + var(--grid-width))), repeating-linear-gradient(90deg, transparent, transparent var(--grid-size),color-mix(in lch, var(--color), transparent 80%) 0, color-mix(in lch, var(--color), transparent 80%) calc(var(--grid-size) + var(--grid-width)));
		mask-image: linear-gradient(-45deg, transparent 50%,black);
	}
}

h2,p {
	margin: 0;
}

button, dialog {
	padding: 0;
	border: 0;
	background: none;
}

button {
	cursor: pointer;
}

.dialog-wrapper {
	
	max-height: 50vh;
	color: var(--color);
	background: var(--background);
	border: 4px solid var(--color);
	max-width: 500px;
	border-radius: 20px;
	padding: 2em;
	position: relative;
	z-index: 1;
	box-shadow: 1px 1px 0px 0px var(--color), 2px 2px 0px 0px var(--color), 3px 3px 0px 0px var(--color),4px 4px 0px 0px var(--color),5px 5px 0px 0px var(--color);
}

dialog {
	overflow-y: auto;
	padding: 20px;
	&,::backdrop {
		transition: display 0.3s allow-discrete, overlay 0.3s allow-discrete;
	}
	
	animation: exit 0.3s forwards ease, fade-out 0.3s forwards ease;

	&[open] {
		animation: enter 0.3s ease, fade-in 0.3s forwards ease;
		transform: none;
	}
	
	&::backdrop {
		animation: fade-out 0.3s forwards ease;
	}
	&[open]::backdrop {
		animation: fade-in 0.3s forwards ease;
	}
}

.trigger-button {
	--color: #333;
	--background: white;
	
	outline: none;
	&:focus-visible span {
	 	outline: 5px dashed var(--focus);
		outline-offset: 3px;
	}
	
	transition: transform 0.2s cubic-bezier(.3, .7, .4, 1);
	font-weight: bold;
	text-transform: uppercase;
	display: block;
	max-width: max-content;
	position: relative;
	font-size: 1.2rem;
	border-radius: 999px;
	
	span {
		display: flex;
		gap: 0.5em;
		align-items: center;
		max-width: max-content;
		background: var(--background);
		color: var(--color);
		border: 4px solid var(--color);
		padding: 0.8em 1.6em;
		position: relative;
		overflow: hidden;
	}
	
	&::before,&::after,span::before,span {
		transition: inherit;
		border-radius: inherit;
		box-shadow: 1px 1px 0px 0px var(--color), 2px 2px 0px 0px var(--color), 3px 3px 0px 0px var(--color);
	}
	
	&::before,&::after,span::before {
		content: '';
		z-index: -1;
		position: absolute;
		inset:0;
	}
	
	&::before {
		transform: translate(2px,2px);
	}	
	
	&:hover {
		span {
			transform: translate(-2px,-2px);
		}
	}
	
	&:active {
		span, &::after {
			transform: translate(2px,2px);
		}
	}
	
}

html, body  {
	height: 100%;
}
body {
	margin: 0;
	display: grid;
	place-items: center;
}

@keyframes fade-in {
	from { 
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

@keyframes fade-out {
	from {
		opacity: 1;
	}
	to {
		opacity: 0;
	}
}

@keyframes enter {
	from {
		translate: 0px -30px;
	}
	to {
		translate: 0px 0px;
	}
}

@keyframes exit {
	from {
		translate: 0px 0px;
	}
	to {
		translate: 0px 30px;
	}
}

.close-button {
	margin-left: auto;
	margin-bottom: 20px;
		display: flex;
	align-items: center;
	gap: 0.5em;
		max-width: max-content;
		background: var(--background);
		color: var(--color);
		border: 4px solid var(--color);
		padding: 0.6em 1.2em;
		position: relative;
		overflow: hidden;
	font-size: 0.8rem;
	border-radius: 999px;
	font-weight: bold;
	text-transform: uppercase;
	box-shadow: 1px 1px 0px 0px var(--color), 2px 2px 0px 0px var(--color), 3px 3px 0px 0px var(--color),4px 4px 0px 0px var(--color),5px 5px 0px 0px var(--color);
	transition: color 0.3s ease, background 0.3s ease;
	
	&::before {
		content: '';
		position: fixed;
		inset: 0;
		z-index: -1;
	}
	
	&:focus-visible {
	 	outline: 5px dashed var(--focus);
		outline-offset: 3px;
	}
	
	&:hover {
		color: var(--background);
		background: var(--color);
	}
}

[method="dialog"] {
	display: contents;
}
!

JS
!
999px

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