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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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Add External Stylesheets/Pens

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <container>
	<h1>👋 If you find this guide helpful, consider <a href="https://jonlehman.medium.com/" style="color: var(--blue)">following me on Medium</a> or check out the <a href="https://jonlehman.medium.com/how-to-underline-text-with-css-customize-the-style-dce7f8541bbd" style="color: var(--blue)">article I put togeter on this topic.</a></h1>
</container>

<container>
	<div class="setting-title">
		<h2>Decorations</h2>
		<div></div>
	</div>
</container>

<!-- Decor Style -->
<section>
	<container>
		<h3>Decor Style</h3>
		<div class="grid">
			<!-- A1 Basic Underline -->
			<div class="card">
				<div class="example">
					<p class="a1">Basic Underline</p>
					<div class="class-tag">a1</div>
				</div>
				<code>text-decoration-line: underline;
					text-decoration-style: solid;
					/* ▲ solid is default ▲ */
				</code>
			</div>
			<!-- A2 Double Underline -->
			<div class="card">
				<div class="example">
					<p class="a2">Double Underline</p>
					<div class="class-tag">a2</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-style: double;
				</code>
			</div>
			<!-- A3 Dashed Underline -->
			<div class="card">
				<div class="example">
					<p class="a3">Dashed Underline</p>
					<div class="class-tag">a3</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-style: dashed;
				</code>
			</div>
			<!-- A4 Dotted Underline -->
			<div class="card">
				<div class="example">
					<p class="a4">Dotted Underline</p>
					<div class="class-tag">a4</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-style: dotted;
				</code>
			</div>
			<!-- A5 Wavy Underline -->
			<div class="card">
				<div class="example">
					<p class="a5">Wavy Underline</p>
					<div class="class-tag">a5</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-style: wavy;
				</code>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Decor Placement -->
<section>
	<container>
		<h3>Decor Placement</h3>
		<div class="grid">
			<!-- B1 Underline -->
			<div class="card">
				<div class="example">
					<p class="b1">Underline</p>
					<div class="class-tag">b1</div>
				</div>
				<code>text-decoration-line: underline;
				</code>
			</div>
			<!-- B2 Double Underline -->
			<div class="card">
				<div class="example">
					<p class="b2">Overline</p>
					<div class="class-tag">b2</div>
				</div>
				<code>text-decoration-line: overline;
				</code>
			</div>
			<!-- B3 Line-Through -->
			<div class="card">
				<div class="example">
					<p class="b3">Line-through</p>
					<div class="class-tag">b3</div>
				</div>
				<code>text-decoration-line: line-through;
				</code>
			</div>
			<!-- Tip -->
			<div class="tip">
				<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" fill="none" viewBox="0 0 40 40">
						<path fill="var(--blue)" d="M24.167 15.833c0-5.05-4.117-9.166-9.167-9.166s-9.167 4.116-9.167 9.166c0 4.117 2.484 6.484 3.917 7.5h10.5c1.433-1.016 3.917-3.383 3.917-7.5Z" opacity=".3"/>
						<path fill="var(--blue)" d="M11.816 34.318c-.164-.527.298-.985.85-.985h4.667c.553 0 1.015.458.85.985A3.347 3.347 0 0 1 15 36.667a3.347 3.347 0 0 1-3.184-2.349ZM8.333 30c0 .92.747 1.667 1.667 1.667h10a1.667 1.667 0 1 0 0-3.334H10c-.92 0-1.667.747-1.667 1.667ZM27.5 15.833c0 6.367-4.433 9.767-6.283 10.834H8.783C6.933 25.6 2.5 22.2 2.5 15.833c0-6.9 5.6-12.5 12.5-12.5s12.5 5.6 12.5 12.5Zm-3.333 0c0-5.05-4.117-9.166-9.167-9.166s-9.167 4.116-9.167 9.166c0 4.117 2.484 6.484 3.917 7.5h10.5c1.433-1.016 3.917-3.383 3.917-7.5Zm11.527-3.718a.5.5 0 0 1-.245.246l-1.128.518a.5.5 0 0 0 0 .909l1.128.518a.5.5 0 0 1 .245.245l.518 1.128a.5.5 0 0 0 .909 0l.518-1.128a.5.5 0 0 1 .246-.245l1.127-.518a.5.5 0 0 0 0-.909l-1.127-.518a.5.5 0 0 1-.246-.246l-.518-1.127a.5.5 0 0 0-.909 0l-.518 1.127Zm-4.482-3.112a.5.5 0 0 0 .91 0l1.034-2.267a.5.5 0 0 1 .247-.247l2.267-1.034a.5.5 0 0 0 0-.91l-2.267-1.034a.5.5 0 0 1-.247-.247L32.12.997a.5.5 0 0 0-.91 0l-1.034 2.267a.5.5 0 0 1-.247.247l-2.267 1.034a.5.5 0 0 0 0 .91l2.267 1.034a.5.5 0 0 1 .247.247l1.035 2.267Z"/>
				</svg>
				<p>Tip: text-decoration-line can be used along with text-decoration-style, creating unique combos. See the “Shorthand Combos” section below for examples.</p>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Decor Thickness -->
<section>
	<container>
		<h3>Decor Thickness</h3>
		<div class="grid">
			<!-- C1 Auto Thick -->
			<div class="card">
				<div class="example">
					<p class="c1">Basic Underline</p>
					<div class="class-tag">c1</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: auto;
							/* ▲ auto is default ▲ */
				</code>
			</div>
			<!-- C2 From-Font Thick -->
			<div class="card">
				<div class="example">
					<p class="c2">From-Font Thick</p>
					<div class="class-tag">c2</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: from-font;
				</code>
			</div>
			<!-- C3 Dashed Underline -->
			<div class="card">
				<div class="example">
					<p class="c3">4px Thick</p>
					<div class="class-tag">c3</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: 4px;
				</code>
			</div>
			<!-- C4 10% Thick -->
			<div class="card">
				<div class="example">
					<p class="c4">10% Thick</p>
					<div class="class-tag">c4</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: 10%;
				</code>
			</div>
			<!-- C5 Wavy Underline -->
			<div class="card">
				<div class="example">
					<p class="c5">0.5em Thick</p>
					<div class="class-tag">c5</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: 0.5em;
				</code>
			</div>
			<!-- C6 Thicc -->
			<div class="card">
				<div class="example">
					<p class="c6">Thicc</p>
					<div class="class-tag">c6</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-thickness: 100%;
				</code>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Decor Color -->
<section>
	<container>
		<h3>Decor Color</h3>
		<div class="grid">
			<!-- D1 Current Color Underline -->
			<div class="card">
				<div class="example">
					<p class="d1">Current Color Underline</p>
					<div class="class-tag">d1</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-color: currentcolor;
							/* ▲ currentcolor is default ▲ */
				</code>
			</div>
			<!-- D2 Turquoise Underline -->
			<div class="card">
				<div class="example">
					<p class="d2">Deep Turquoise Underline</p>
					<div class="class-tag">d2</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-color: DeepPink;
				</code>
			</div>
			<!-- D3 #C55555 Underline -->
			<div class="card">
				<div class="example">
					<p class="d3">#C55555 Underline</p>
					<div class="class-tag">d3</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-color: #C55;
				</code>
			</div>
			<!-- D4 rgba(255, 128, 128, 0.5) -->
			<div class="card">
				<div class="example">
					<p class="d4">rgba(255, 128, 128, 0.5)</p>
					<div class="class-tag">d4</div>
				</div>
				<code>text-decoration-line: underline;
							text-decoration-color: rgba(255, 128, 128, 0.5)
				</code>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Underline Offset -->
<section>
	<container>
		<h3>Underline Offset</h3>
		<div class="grid">
			<!-- E1 Auto Offset -->
			<div class="card">
				<div class="example">
					<p class="e1">Auto Offset</p>
					<div class="class-tag">e1</div>
				</div>
				<code>text-decoration-line: underline;
							text-underline-offset: auto;
							/* ▲ auto is default ▲ */
				</code>
			</div>
			<!-- E2 From Font Offset -->
			<div class="card">
				<div class="example">
					<p class="e2">From Font Offset</p>
					<div class="class-tag">e2</div>
				</div>
				<code>text-decoration-line: underline;
							text-underline-offset: from-font;
				</code>
			</div>
			<!-- E3 8px Offset -->
			<div class="card">
				<div class="example">
					<p class="e3">8px Offset</p>
					<div class="class-tag">e3</div>
				</div>
				<code>text-decoration-line: underline;
							text-underline-offset: 8px;
				</code>
			</div>
			<!-- E4 10% Offset -->
			<div class="card">
				<div class="example">
					<p class="e4">10% Offset</p>
					<div class="class-tag">e4</div>
				</div>
				<code>text-decoration-line: underline;
							text-underline-offset: 10%;
				</code>
			</div>
			<!-- E5 0.5em Offset -->
			<div class="card">
				<div class="example">
					<p class="e5">0.5em Offset</p>
					<div class="class-tag">e5</div>
				</div>
				<code>text-decoration-line: underline; 
							text-underline-offset: 0.5em;
				</code>
			</div>
			<!-- Tip -->
			<div class="tip">
				<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" fill="none" viewBox="0 0 40 40">
						<path fill="var(--blue)" d="M24.167 15.833c0-5.05-4.117-9.166-9.167-9.166s-9.167 4.116-9.167 9.166c0 4.117 2.484 6.484 3.917 7.5h10.5c1.433-1.016 3.917-3.383 3.917-7.5Z" opacity=".3"/>
						<path fill="var(--blue)" d="M11.816 34.318c-.164-.527.298-.985.85-.985h4.667c.553 0 1.015.458.85.985A3.347 3.347 0 0 1 15 36.667a3.347 3.347 0 0 1-3.184-2.349ZM8.333 30c0 .92.747 1.667 1.667 1.667h10a1.667 1.667 0 1 0 0-3.334H10c-.92 0-1.667.747-1.667 1.667ZM27.5 15.833c0 6.367-4.433 9.767-6.283 10.834H8.783C6.933 25.6 2.5 22.2 2.5 15.833c0-6.9 5.6-12.5 12.5-12.5s12.5 5.6 12.5 12.5Zm-3.333 0c0-5.05-4.117-9.166-9.167-9.166s-9.167 4.116-9.167 9.166c0 4.117 2.484 6.484 3.917 7.5h10.5c1.433-1.016 3.917-3.383 3.917-7.5Zm11.527-3.718a.5.5 0 0 1-.245.246l-1.128.518a.5.5 0 0 0 0 .909l1.128.518a.5.5 0 0 1 .245.245l.518 1.128a.5.5 0 0 0 .909 0l.518-1.128a.5.5 0 0 1 .246-.245l1.127-.518a.5.5 0 0 0 0-.909l-1.127-.518a.5.5 0 0 1-.246-.246l-.518-1.127a.5.5 0 0 0-.909 0l-.518 1.127Zm-4.482-3.112a.5.5 0 0 0 .91 0l1.034-2.267a.5.5 0 0 1 .247-.247l2.267-1.034a.5.5 0 0 0 0-.91l-2.267-1.034a.5.5 0 0 1-.247-.247L32.12.997a.5.5 0 0 0-.91 0l-1.034 2.267a.5.5 0 0 1-.247.247l-2.267 1.034a.5.5 0 0 0 0 .91l2.267 1.034a.5.5 0 0 1 .247.247l1.035 2.267Z"/>
				</svg>
				<p>Tip: text-underline-offset is only available for underlines. Overlines and line-through decorations don’t have offset options. :(</p>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Shorthand Combos -->
<section>
	<container>
		<h3>Shorthand Combos</h3>
		<div class="grid" style="grid-template-columns: repeat(2, 1fr);">
			<!-- DeepSkyBlue Wavy Strikethrough -->
			<div class="card">
				<div class="example">
					<p class="f1">DeepSkyBlue Wavy Strikethrough</p>
					<div class="class-tag">f1</div>
				</div>
				<code>text-decoration: line-through wavy deepskyblue 4px;</code>
			</div>
			<!-- F2 Redacted Text -->
			<div class="card">
				<div class="example">
					<p>Hover to reveal <span class="f2">shocking</span> redacted text</p>
					<div class="class-tag">f2</div>
				</div>
				<code>text-decoration: line-through solid black 100%;
							/* remove the decoration on hover for a cool reveal */
				</code>
			</div>
			<!-- F3 Perforated Text -->
			<div class="card">
				<div class="example">
					<p class="f3">Perforated Text</p>
					<div class="class-tag">f3</div>
				</div>
				<code>text-decoration: overline underline dotted silver 2px;
							text-underline-offset: 4px
				</code>
			</div>
			<!-- F4 Peaking Through Blinds -->
			<div class="card">
				<div class="example">
					<p class="f4">Peaking Through Blinds</p>
					<div class="class-tag">f4</div>
				</div>
				<code>text-decoration: overline line-through underline double silver 2px;</code>
			</div>
			<!-- F5 Bad Grammmar -->
			<div class="card">
				<div class="example">
					<p class="f5">Bad Grammmar</p>
					<div class="class-tag">f5</div>
				</div>
				<code>text-decoration: underline wavy red;</code>
			</div>
		</div><!--end grid-->
	</container>
</section>

<!-- Silliness & Animations -->
<section>
	<container>
		<h3>Silliness & Animations</h3>
		<div class="grid" style="grid-template-columns: repeat(1, 1fr);">
			<!-- G1 Meteor Shower -->
			<div class="card">
				<div class="example">
					<p class="g1"><span>M</span><span>e</span><span>t</span><span>e</span><span>o</span><span>r</span><span> </span><span>s</span><span>h</span><span>o</span><span>w</span><span>e</span><span>r</span>
					<p>
					<div class="class-tag">g1</div>
				</div>
				<code class="scroll">.g1 span {
	text-decoration: underline 2px black;
	text-underline-offset: 8px;
	animation: g1 linear 1400ms infinite forwards
}
					
.g1 span:nth-of-type(1) {animation-delay: 0ms}
.g1 span:nth-of-type(2) {animation-delay: 100ms}
.g1 span:nth-of-type(3) {animation-delay: 200ms}
.g1 span:nth-of-type(4) {animation-delay: 300ms}
.g1 span:nth-of-type(5) {animation-delay: 400ms}
.g1 span:nth-of-type(6) {animation-delay: 500ms}
.g1 span:nth-of-type(7) {animation-delay: 600ms}
.g1 span:nth-of-type(8) {animation-delay: 700ms}
.g1 span:nth-of-type(9) {animation-delay: 800ms}
.g1 span:nth-of-type(10) {animation-delay: 900ms}
.g1 span:nth-of-type(11) {animation-delay: 1000ms}
.g1 span:nth-of-type(12) {animation-delay: 1100ms}
.g1 span:nth-of-type(13) {animation-delay: 1200ms}
					
@keyframes g1 {
	0% { text-decoration-color: DarkOrange }
	10% { text-decoration-color: LightYellow}
	70% { text-decoration-color: black }
}
				</code>
			</div>
			<!-- G2 Rainbow Dots -->
			<div class="card">
				<div class="example">
					<p class="g2"><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><span>o</span><p>
					<div class="class-tag">g2</div>
				</div>
				<code class="scroll">.g2 span {
	text-decoration: line-through 100% dotted Salmon;
	text-underline-offset: 8px;
	animation: g2 linear 4000ms infinite;
}
					
.g2 span:nth-of-type(1) {animation-delay: 0ms}
.g2 span:nth-of-type(2) {animation-delay: 100ms}
.g2 span:nth-of-type(3) {animation-delay: 200ms}
.g2 span:nth-of-type(4) {animation-delay: 300ms}
.g2 span:nth-of-type(5) {animation-delay: 400ms}
.g2 span:nth-of-type(6) {animation-delay: 500ms}
.g2 span:nth-of-type(7) {animation-delay: 600ms}
.g2 span:nth-of-type(8) {animation-delay: 700ms}
.g2 span:nth-of-type(9) {animation-delay: 800ms}
.g2 span:nth-of-type(10) {animation-delay: 900ms}
					
@keyframes g2 {
	0% { text-decoration-color: Salmon }
	12.5% { text-decoration-color: LightSalmon }
	25% { text-decoration-color: Gold }
	37.5% { text-decoration-color: PaleGreen }
	50% { text-decoration-color: Turquoise }
	62.5% { text-decoration-color: MediumPurple }
	75% { text-decoration-color: Violet }
	87.5% { text-decoration-color: MediumVioletRed  }
}
				</code>
			</div>
			<!-- G3 Wavy Waves -->
			<div class="card">
				<div class="example">
					<p class="g3"><span>W</span><span>a</span><span>v</span><span>y</span><span> </span><span>w</span><span>a</span><span>v</span><span>e</span><span>s</span><p>
					<div class="class-tag">g3</div>
				</div>
				<code class="scroll">.g3 span {
	display: inline-block;
	text-decoration: underline 3px RoyalBlue;
	text-underline-offset: 12px;
	animation: g3 linear 3000ms infinite;
}
					
.g3 span:nth-of-type(1) {animation-delay: 0ms}
.g3 span:nth-of-type(2) {animation-delay: 100ms}
.g3 span:nth-of-type(3) {animation-delay: 200ms}
.g3 span:nth-of-type(4) {animation-delay: 300ms}
.g3 span:nth-of-type(5) {animation-delay: 400ms}
.g3 span:nth-of-type(6) {animation-delay: 500ms}
.g3 span:nth-of-type(7) {animation-delay: 600ms}
.g3 span:nth-of-type(8) {animation-delay: 700ms}
.g3 span:nth-of-type(9) {animation-delay: 800ms}
.g3 span:nth-of-type(10) {animation-delay: 900ms}
					
@keyframes g3 {
	0% { text-decoration-style: wavy; text-underline-offset: 8px; text-decoration-color: PowderBlue }
	5% { text-decoration-style: wavy; text-underline-offset: 0px; text-decoration-color: RoyalBlue }
	25% { text-decoration-style: solid; text-underline-offset: 12px }
	37.5% { text-decoration-color: PowderBlue }
	45% { text-decoration-color: RoyalBlue }
	87.5% { text-decoration-color: RoyalBlue }
	98% { text-decoration-color: PowderBlue}
}
				</code>
			</div>
		</div><!--end grid-->
	</container>
</section>
!

CSS 

              
                .a1 {
	text-decoration-line: underline;
	text-decoration-style: solid;
	/* ▲ solid is default ▲ */
}

.a2 {
	text-decoration-line: underline;
	text-decoration-style: double;
}

.a3 {
	text-decoration-line: underline;
	text-decoration-style: dashed;
}

.a4 {
	text-decoration-line: underline;
	text-decoration-style: dotted;
}

.a5 {
	text-decoration-line: underline;
	text-decoration-style: wavy;
}

.b1 {
	text-decoration-line: underline;
}

.b2 {
	text-decoration-line: overline;
}

.b3 {
	text-decoration-line: line-through;
}

.c1 {
	text-decoration-line: underline;
	text-decoration-thickness: auto;
	/* ▲ auto is default ▲ */
}

.c2 {
	text-decoration-line: underline;
	text-decoration-thickness: from-font;
}

.c3 {
	text-decoration-line: underline;
	text-decoration-thickness: 4px;
}

.c4 {
	text-decoration-line: underline;
	text-decoration-thickness: 10%;
}

.c5 {
	text-decoration-line: underline;
	text-decoration-thickness: 0.5em;
}

.c6 {
	text-decoration-line: underline;
	text-decoration-thickness: 100%
}

.d1 {
	text-decoration-line: underline;
	text-decoration-color: currentcolor;
	/* ▲ currentcolor is default ▲ */
}

.d2 {
	text-decoration-line: underline;
	text-decoration-color: Turquoise;
}

.d3 {
	text-decoration-line: underline;
	text-decoration-color: #C55;
}

.d4 {
	text-decoration-line: underline;
	text-decoration-color: rgba(255, 128, 128, 0.5)
}

.e1 {
	text-decoration-line: underline;
	text-underline-offset: auto;
	/* ▲ auto is default ▲ */
}

.e2 {
	text-decoration-line: underline;
	text-underline-offset: from-font;
}

.e3 {
	text-decoration-line: underline;
	text-underline-offset: 8px;
}

.e4 {
	text-decoration-line: underline;
	text-underline-offset: 10%;
}

.e5 {
	text-decoration-line: underline;
	text-underline-offset: 0.5em;
}

.f1 {
	text-decoration: line-through wavy deepskyblue 4px;
}

.f3 {
	text-decoration: overline underline dotted silver 2px;
	text-underline-offset: 4px;
}

.f4 {
	text-decoration: overline line-through underline double silver 2px ;
}

.f5 {
	text-decoration: underline wavy red;
}

.g1 span {
	text-decoration: underline 2px black;
	text-underline-offset: 8px;
	animation: g1 linear 1400ms infinite forwards
}
.g1 span:nth-of-type(1) {animation-delay: 0ms}
.g1 span:nth-of-type(2) {animation-delay: 100ms}
.g1 span:nth-of-type(3) {animation-delay: 200ms}
.g1 span:nth-of-type(4) {animation-delay: 300ms}
.g1 span:nth-of-type(5) {animation-delay: 400ms}
.g1 span:nth-of-type(6) {animation-delay: 500ms}
.g1 span:nth-of-type(7) {animation-delay: 600ms}
.g1 span:nth-of-type(8) {animation-delay: 700ms}
.g1 span:nth-of-type(9) {animation-delay: 800ms}
.g1 span:nth-of-type(10) {animation-delay: 900ms}
.g1 span:nth-of-type(11) {animation-delay: 1000ms}
.g1 span:nth-of-type(12) {animation-delay: 1100ms}
.g1 span:nth-of-type(13) {animation-delay: 1200ms}
@keyframes g1 {
	0% { text-decoration-color: DarkOrange }
	10% { text-decoration-color: LightYellow}
	70% { text-decoration-color: black }
}

.g2 span {
	text-decoration: line-through 100% dotted Salmon;
	text-underline-offset: 8px;
	animation: g2 linear 4000ms infinite;
}
.g2 span:nth-of-type(1) {animation-delay: 0ms}
.g2 span:nth-of-type(2) {animation-delay: 100ms}
.g2 span:nth-of-type(3) {animation-delay: 200ms}
.g2 span:nth-of-type(4) {animation-delay: 300ms}
.g2 span:nth-of-type(5) {animation-delay: 400ms}
.g2 span:nth-of-type(6) {animation-delay: 500ms}
.g2 span:nth-of-type(7) {animation-delay: 600ms}
.g2 span:nth-of-type(8) {animation-delay: 700ms}
.g2 span:nth-of-type(9) {animation-delay: 800ms}
.g2 span:nth-of-type(10) {animation-delay: 900ms}
@keyframes g2 {
	0% { text-decoration-color: Salmon }
	12.5% { text-decoration-color: LightSalmon }
	25% { text-decoration-color: Gold }
	37.5% { text-decoration-color: PaleGreen }
	50% { text-decoration-color: Turquoise }
	62.5% { text-decoration-color: MediumPurple }
	75% { text-decoration-color: Violet }
	87.5% { text-decoration-color: MediumVioletRed  }
}

.g3 span {
	display: inline-block;
	text-decoration: underline 3px RoyalBlue;
	text-underline-offset: 12px;
	animation: g3 linear 3000ms infinite;
}
.g3 span:nth-of-type(1) {animation-delay: 0ms}
.g3 span:nth-of-type(2) {animation-delay: 100ms}
.g3 span:nth-of-type(3) {animation-delay: 200ms}
.g3 span:nth-of-type(4) {animation-delay: 300ms}
.g3 span:nth-of-type(5) {animation-delay: 400ms}
.g3 span:nth-of-type(6) {animation-delay: 500ms}
.g3 span:nth-of-type(7) {animation-delay: 600ms}
.g3 span:nth-of-type(8) {animation-delay: 700ms}
.g3 span:nth-of-type(9) {animation-delay: 800ms}
.g3 span:nth-of-type(10) {animation-delay: 900ms}
@keyframes g3 {
	0% { text-decoration-style: wavy; text-underline-offset: 8px; text-decoration-color: PowderBlue }
	5% { text-decoration-style: wavy; text-underline-offset: 0px; text-decoration-color: RoyalBlue }
	25% { text-decoration-style: solid; text-underline-offset: 12px }
	37.5% { text-decoration-color: PowderBlue }
	45% { text-decoration-color: RoyalBlue }
	87.5% { text-decoration-color: RoyalBlue }
	98% { text-decoration-color: PowderBlue}
}

/*////////////////////////////////
  Presentation / Layout Styles
////////////////////////////////*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swap');

:root {
	--white: white;
	--gray0: #F8FAFC;
	--gray1: #F1F5F9;
	--gray2: #E2E8F0;
	--gray4: #94A3B8;
	--gray5: #64748B;
	--gray7: #334155;
	--gray9: #0F172A;
	--blue: #4F46E5;
}

* {
	font-family: 'Inter', sans-serif;
}

body {
	display: flex;
	flex-direction: column;
	align-items: center;
	background-color: var(--gray1);
}

h1 {
	font-size: 32px;
	font-weight: 600;
	color: var(--gray5);
	line-height: 165%;
	padding: 100px 0px;
}

h2 {
	font-size: 28px;
	font-weight: 600;
	color: var(--gray7);
}

h3 {
	font-size: 24px;
	font-weight: normal;
	color: var(--gray7);
}

.setting-title {
	width: 100%;
	display: flex;
	justify-content: center;
	align-items: center;
}

.setting-title div {
	height: 2px;
	width: 100%;
	margin-left: 16px;
	background-color: var(--gray5)
}

section {
	width: 100%;
	display: flex;
	flex-direction: column;
	align-items: center;
}

section:not(:first-of-type) {
	margin-top: 40px;
}

container {
	width: 920px;
	max-width: 95%;
	display: flex;
	flex-direction: column;
}

.grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	grid-template-rows: repeat(1fr);
	grid-column-gap: 16px;
	grid-row-gap: 16px;
}

@media only screen and (max-width: 800px) {
	.grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media only screen and (max-width: 560px) {
	.grid {
		grid-template-columns: repeat(1, 1fr);
	}
}

.card {
	width: 100%;
	display: inline-flex;
	flex-direction: column;
	background-color: var(--white);
	border: 1px solid var(--gray2);
	border-radius: 6px;
	overflow: hidden;
	margin: 0px;
}

.example {
	position: relative;
	width: 100%;
	display: flex;
	align-items: center;
	padding: 24px 24px;
	font-size: 18px;
	color: var(--gray9);
}

.class-tag {
	position: absolute;
	bottom: -8px;
	margin-top: -20px;
	padding: 2px 4px;
	border-radius: 2px;
	background-color: var(--gray2);
	font-size: 12px;
	color: var(--gray5)
}

.class-tag::before {
	content: 'class: '
}

code {
	white-space: pre-line;
	max-width: 100%;
	min-height: 100%;
	padding: 24px;
	background-color: var(--gray0);
	font-family: 'Roboto Mono', monospace;
	font-size: 12px;
	color: var(--gray5);
	line-height: 1.5
}

code.scroll {
	white-space: pre;
	min-height: auto;
	max-height: 180px;
	overflow-y: scroll;
}

.tip {
	grid-column: 1 / -1;
	display: flex;
	justify-content: center;
	align-items: center;
	padding: 24px;
	background-color: var(--white);
	border: 1px solid var(--gray2);
	border-radius: 6px;
	font-family: 'Roboto Mono', monospace;
	font-size: 12px;
	color: var(--blue);
	line-height: 1.5;
}

.tip p {
	margin-left: 24px;
	font-family: 'Roboto Mono', monospace;
}





.underline p:nth-of-type(2) {
	text-decoration: underline wavy red;
}

.test1 span {
	font-size: 22px;
	text-decoration: underline 2px black;
	text-underline-offset: 8px;
	animation: test1 linear 1400ms infinite forwards
}

.test1 span:nth-of-type(1) {animation-delay: 0ms}
.test1 span:nth-of-type(2) {animation-delay: 100ms}
.test1 span:nth-of-type(3) {animation-delay: 200ms}
.test1 span:nth-of-type(4) {animation-delay: 300ms}
.test1 span:nth-of-type(5) {animation-delay: 400ms}
.test1 span:nth-of-type(6) {animation-delay: 500ms}
.test1 span:nth-of-type(7) {animation-delay: 600ms}
.test1 span:nth-of-type(8) {animation-delay: 700ms}
.test1 span:nth-of-type(9) {animation-delay: 800ms}
.test1 span:nth-of-type(10) {animation-delay: 900ms}
.test1 span:nth-of-type(11) {animation-delay: 1000ms}
.test1 span:nth-of-type(12) {animation-delay: 1100ms}
.test1 span:nth-of-type(13) {animation-delay: 1200ms}

@keyframes test1 {
	0% { text-decoration-color: DarkOrange }
	10% { text-decoration-color: LightYellow}
	70% { text-decoration-color: black }
}

.test2 span {
	font-size: 22px;
	text-decoration: line-through 100% dotted Salmon;
	text-underline-offset: 8px;
	animation: test2 linear 4000ms infinite;
}

.test2 span:nth-of-type(1) {animation-delay: 0ms}
.test2 span:nth-of-type(2) {animation-delay: 100ms}
.test2 span:nth-of-type(3) {animation-delay: 200ms}
.test2 span:nth-of-type(4) {animation-delay: 300ms}
.test2 span:nth-of-type(5) {animation-delay: 400ms}
.test2 span:nth-of-type(6) {animation-delay: 500ms}
.test2 span:nth-of-type(7) {animation-delay: 600ms}
.test2 span:nth-of-type(8) {animation-delay: 700ms}
.test2 span:nth-of-type(9) {animation-delay: 800ms}
.test2 span:nth-of-type(10) {animation-delay: 900ms}

@keyframes test2 {
	0% { text-decoration-color: Salmon }
	12.5% { text-decoration-color: LightSalmon }
	25% { text-decoration-color: Gold }
	37.5% { text-decoration-color: PaleGreen }
	50% { text-decoration-color: Turquoise }
	62.5% { text-decoration-color: MediumPurple }
	75% { text-decoration-color: Violet }
	87.5% { text-decoration-color: MediumVioletRed  }
}

.test3 span {
	font-size: 22px;
	text-decoration: underline 3px RoyalBlue;
	text-underline-offset: 12px;
	animation: test3 linear 3000ms infinite;
}

.test3 span:nth-of-type(1) {animation-delay: 0ms}
.test3 span:nth-of-type(2) {animation-delay: 100ms}
.test3 span:nth-of-type(3) {animation-delay: 200ms}
.test3 span:nth-of-type(4) {animation-delay: 300ms}
.test3 span:nth-of-type(5) {animation-delay: 400ms}
.test3 span:nth-of-type(6) {animation-delay: 500ms}
.test3 span:nth-of-type(7) {animation-delay: 600ms}
.test3 span:nth-of-type(8) {animation-delay: 700ms}
.test3 span:nth-of-type(9) {animation-delay: 800ms}
.test3 span:nth-of-type(10) {animation-delay: 900ms}

@keyframes test3 {
	0% { text-decoration-style: wavy; text-underline-offset: 8px; text-decoration-color: PowderBlue }
	5% { text-decoration-style: wavy; text-underline-offset: 0px; text-decoration-color: RoyalBlue }
	25% { text-decoration-style: solid; text-underline-offset: 12px }
	37.5% { text-decoration-color: PowderBlue }
	45% { text-decoration-color: RoyalBlue }
	87.5% { text-decoration-color: RoyalBlue }
	98% { text-decoration-color: PowderBlue}
}

.test4 {
	font-style: oblique 90deg
}
!

JS
!
999px

Console