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HTML

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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- The menu can be opened from anywhere by dispatching an event -->

<!-- Updated Dec 2020 with fixed x -->

<div class="min-h-screen bg-gray-100">
	
	<header class="w-full bg-indigo-500 text-white h-16 px-16 flex items-center justify-end">
		<button
			x-data="{usedKeyboard: false}"
			@keydown.window.tab="usedKeyboard = true"
			@click="$dispatch('open-menu', { open: true })"
			:class="{'focus:outline-none': !usedKeyboard}">
			<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" class="feather feather-menu stroke-current"><line x1="3" y1="12" x2="21" y2="12"></line><line x1="3" y1="6" x2="21" y2="6"></line><line x1="3" y1="18" x2="21" y2="18"></line></svg>
		</button>
	</header>

	<div class="grid md:grid-cols-2 lg:grid-cols-3 gap-10 p-16">
		<div class="bg-gray-500 h-64"></div>
		<button
			x-data="{usedKeyboard: false}"
			@keydown.window.tab="usedKeyboard = true"
			role=button
			@click="$dispatch('open-menu', { open: true })"
			:class="{'focus:outline-none': !usedKeyboard}"
			class="bg-indigo-500 hover:bg-indigo-400 h-64 text-white font-extrabold text-4xl flex items-center justify-center uppercase">
			Open Menu
		</button>
		<div class="bg-gray-500 h-64"></div>
		<div class="bg-gray-500 h-64"></div>
		<div class="bg-gray-500 h-64"></div>
		
		<div class="bg-gray-500 h-64"></div>
		<div class="bg-gray-500 h-64"></div>
		<div class="bg-gray-500 h-64"></div>
	</div>
</div>

<section
	x-data="slideout()"
	x-cloak
	@open-menu.window="open = $event.detail.open"
	@keydown.window.tab="usedKeyboard = true"
	@keydown.escape="open = false"
	x-init="init()">
	<div
		x-show.transition.opacity.duration.500="open"
		@click="open = false"
		class="fixed inset-0 bg-black bg-opacity-25"></div>
	<div
		class="fixed transition duration-300 right-0 top-0 transform w-full max-w-xs h-screen bg-gray-100 overflow-hidden"
		:class="{'translate-x-full': !open}">
		<button
			@click="open = false"
			x-ref="closeButton"
			:class="{'focus:outline-none': !usedKeyboard}"
			class="fixed top-0 right-0 mr-4 mt-2 z-50">
			<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" class="feather feather-x"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg>
		</button>
		<div class="p-16 px-6 absolute top-0 h-full overflow-y-scroll">
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
		</div>
	</div>
</section>


<!-- Dev tools -->
<div
	id="alpine-devtools"
	x-data="devtools('left')"
	x-show="alpines.length"
	x-init="start()">
</div>
!

CSS 

              
                		[x-cloak] { display: none; }
!

JS 

              
                function slideout() {
	return {
		open: false,
		usedKeyboard: false,
		init() {
			this.$watch('open', value => {
				value && this.$refs.closeButton.focus()
				this.toggleOverlay()
			})
			this.toggleOverlay()
		},
		toggleOverlay() {
			document.body.classList[this.open ? 'add' : 'remove']('h-screen', 'overflow-hidden')
		}
	}
}
!
999px

Console