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HTML

              
                <ul>
	<li>
		<a href="#">
			<i class="ai-home"></i>
			<span>Dashboard</span>
		</a>
	</li>
	<li>
		<a href="#">
			<i class="ai-image"></i>
			<span>Images</span>
		</a>
	</li>	
	<li>
		<a href="#">
			<i class="ai-file"></i>
			<span>Files</span>
		</a>
	</li>
	<li>
		<a href="#">
			<i class="ai-game-controller"></i>
			<span>Games</span>
		</a>
	</li>	
	<li>
		<a href="#">
			<i class="ai-book"></i>
			<span>Books</span>
		</a>
	</li>
	<li>
		<a href="#">
			<i class="ai-bell"></i>
			<span>Notifications</span>
		</a>
	</li>
	<li>	
		<a href="#">
			<i class="ai-gear"></i>
			<span>Settings</span>
		</a>
	</li>
	<li>
		<a href="#">
			<i class="ai-person"></i>
			<span>Profile</span>
		</a>
	</li>
</ul>

<details>
	<summary>How it works<i class="ai-question-fill"></i></summary>
	<div>
			<p>Inside each <code>&lt;a&gt;</code> element there's a hidden (using transform and opacity) <code>&lt;span&gt;</code> containing the text. Like this: </p>
		<p><pre><code>a span { 
&nbsp;position: absolute;
&nbsp;left: calc(100% + 1.5rem); //Moves it all the way to the right
&nbsp;
&nbsp;opacity: 0;
&nbsp;transform: scale(0);
&nbsp;transform-origin: center left;
&nbsp;transition: .15s ease;
}</code></pre> </p>
<p>On hover or focus this span becomes visible through a transition of both transform and opacity. Like this:</p>
<p><pre><code>a:hover span, a:focus span { 
&nbsp;opacity: 1;
&nbsp;transform: scale(1);
}</code></pre> </p>
	<p>The <code>&lt;span&gt;</code> also has a psuedo-element in the shape of a rectangle, but rotated 45 degrees to make it look like a triangle. See the code for more details.</p>
	</div>
</details>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

*, *:after, *:before {
	box-sizing: border-box;
}

body {
	font-family: "Inter", sans-serif;
	line-height: 1.5;
	min-height: 100vh;
	display: flex; 
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding-top: 5vh;
	padding-bottom: 5vh;
	background-color: #f2f5f7;
}

 

ul { 
	list-style: none;
	margin: 0;
	padding: 0;
	margin-left: auto; 
	margin-right: auto;
	background-color: #05043e;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	padding: .75rem;
	border-radius: 10px;
	box-shadow: 0 10px 50px 0 rgba(#05043e, .25);
}

li:nth-child(6) {
	margin-top: 5rem; 
	padding-top: 1.25rem;
	border-top: 1px solid #363664;
}

li + li {
	margin-top: .75rem;
}

a {
	color: #FFF; 
	text-decoration: none;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 3rem;
	height: 3rem;
	border-radius: 8px;
	position: relative;
	&:hover, &:focus, &.active {
		background-color: #30305a;
		outline: 0;
		
		span { 
			transform: scale(1);
			opacity: 1;
		}
	}
	
	i {
		font-size: 1.375rem;
	}
	
	span {
		position: absolute;
		background-color: #30305a;
		white-space: nowrap;
		padding: .5rem 1rem;
		border-radius: 6px;
		left: calc(100% + 1.5rem);
		transform-origin: center left;
		transform: scale(0);
		opacity: 0;
		transition: .15s ease;
		&:before {
			content: "";
			display: block;
			width: 12px;
			height: 12px;
			position: absolute;
			background-color: #30305a;
			left: -5px;
			top: 50%;
			transform: translatey(-50%) rotate(45deg);
			border-radius: 3px;
		}
	}
	

}

details {
	position: fixed;
	right: 1rem;
	bottom: 1rem;
	margin-top: 2rem;
	color: #05043e; 
	display: flex;
	flex-direction: column;

	div {
		background-color: #fff;
		box-shadow: 0 5px 10px rgba(#000, 0.15);
		padding: 1.25rem;
		border-radius: 8px;
		position: absolute;
		max-height: calc(100vh - 100px);
		width: 400px;
		max-width: calc(100vw - 2rem);
		bottom: calc(100% + 1rem);
		right: 0;
		overflow: auto;
		transform-origin: 100% 100%;
		&::-webkit-scrollbar {
			width: 15px;
			background-color:#fff;
		}

		&::-webkit-scrollbar-thumb {
			width: 5px;
			border-radius: 99em;
			background-color: #ccc;
			border: 5px solid #fff;
		}
		& > * + * {
			margin-top: 0.75em;
		}

		p > code {
			font-size: 1rem;
			font-family: monospace;
			color: #185adb;
			font-weight: 600;
		}

		pre {
			white-space: pre-line;
			background-color: #f9f9f9;
			border: 1px solid #95a3b9;
			border-radius: 6px;
			font-family: monospace;
			padding: 0.75em;
			font-size: 0.875rem;
			// color: #fff;
		}
	}

	&[open] div {
		animation: scale 0.25s ease;
	}
}

summary {
	display: inline-flex;
	margin-left: auto;
	margin-right: auto;
	justify-content: center;
	align-items: center;
	font-weight: 600;
	padding: 0.625em 1.25em .625em 1.25em;
	border-radius: 99em;
	color: #fff;
	background-color: #185adb;
	box-shadow: 0 5px 15px rgba(#000, 0.1);
	list-style: none;
	text-align: center;
	cursor: pointer;
	transition: 0.15s ease;
	position: relative;
	&::-webkit-details-marker {
		display: none;
	}

	&:hover,
	&:focus {
		background-color: mix(#000, #185adb, 20%);
		// color: #6366f1;
	}

	i {
		font-size: 1.375em;
		margin-left: .25em;
	}
}

@keyframes scale {
	0% {
		transform: scale(0);
	}
	100% {
		transform: scale(1);
	}
}


              
            
!

JS

              
                // The script for the icon font from https://akaricons.com/ is in this pen's JS settings


              
            
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999px

Console