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.
In CodePen, whatever you write in the HTML editor is what goes within the <body>
tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html>
tag. If you want to add classes there that can affect the whole document, this is the place to do it.
In CodePen, whatever you write in the HTML editor is what goes within the <body>
tags in a basic HTML5 template. If you need things in the <head>
of the document, put that code here.
The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.
CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.
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.
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-
.
We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).
Any URLs added here will be added as <link>
s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.
You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.
You can also link to another Pen here (use the .css
URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
JavaScript preprocessors can help make authoring JavaScript easier and more convenient.
Babel includes JSX processing.
Any URL's added here will be added as <script>
s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.
You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.
If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.
You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
Search for and use JavaScript packages from npm here. By selecting a package, an import
statement will be added to the top of the JavaScript editor for this package.
Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.
All packages are different, so refer to their docs for how they work.
If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.
If active, Pens will autosave every 30 seconds after being saved once.
If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.
If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.
Visit your global Editor Settings.
<header class="header">
<label for="theme">Select board theme: </label>
<div class="select">
<select id="theme">
<option value="classic">Classic</option>
<option value="holiday">Holiday 🎄</option>
<option value="lightning">Lightning</option>
<option value="vibes">Total Vibes</option>
<option value="smiles">Smiles</option>
<option value="pickle">Pickle</option>
<option value="png">transparent.png</option>
<option value="debug">Debug</option>
</select>
</div>
<p class="warning"><strong>Theme switcher disabled.</strong> This browser does not support the CSS <code>:has()</code> function. <a href="https://caniuse.com/css-has">Review current support</a></p>
</header>
<main class="scene">
<div class="board">
<span class="logo">CSS<br />is<br />awesome</span>
<div class="wheel"></div>
<div class="wheel"></div>
<div class="wheel"></div>
<div class="wheel"></div>
<div class="truck"></div>
<div class="truck"></div>
</div>
</main>
<footer class="footer">
<input id="wild-mode" type="checkbox" /><label for="wild-mode">Get wild</label>
</footer>
:root {
--border-size: 0.5vmin;
--border-style: solid;
--color-bolt: hsl(0deg 0% 40%);
--color-border: hsl(0 0% 8%);
--color-deck: hsl(10deg 10% 12%);
--color-deck-trim: hsl(0deg 20% 90%);
--color-text: hsl(0deg 0% 96%);
--color-truck: hsl(0deg 0% 30%);
--color-wheel: hsl(0deg 20% 80%);
}
body:has([value="lightning"]:checked) {
--color-bolt: hsl(237deg 74% 55%);
--color-border: hsl(215deg 76% 5%);
--color-deck: hsl(215deg 76% 5%);
--color-deck-trim: hsl(45deg 98% 49%);
--color-text: hsl(45deg 98% 49%);
--color-truck: hsl(237deg 74% 45%);
--color-wheel: hsl(359deg 70% 44%);
}
body:has([value="holiday"]:checked) {
--color-bolt: hsl(0deg 0% 98%);
--color-border: hsl(120deg 59% 22%);
--color-deck: radial-gradient(hsl(0deg 78% 60%) 15%, transparent 16%) 5vmin
5vmin / 2vmin 2vmin,
radial-gradient(hsl(0deg 78% 60%) 15%, transparent 16%) hsl(0deg 78% 52%) 0
0 / 2vmin 2vmin;
--color-deck-trim: hsl(0deg 0% 98%);
--color-text: hsl(0deg 0% 98%);
--color-truck: hsl(120deg 59% 22%);
--color-wheel: hsl(0deg 0% 98%);
}
body:has([value="vibes"]:checked) {
--color-bolt: hsl(0deg 0% 99%);
--color-border: hsl(215deg 76% 5%);
--color-deck: linear-gradient(
45deg,
hsl(240deg 71% 62%) 0%,
hsl(263deg 68% 60%) 7%,
hsl(281deg 63% 57%) 13%,
hsl(298deg 58% 53%) 19%,
hsl(311deg 73% 56%) 24%,
hsl(321deg 91% 59%) 29%,
hsl(327deg 100% 61%) 34%,
hsl(332deg 100% 62%) 39%,
hsl(339deg 100% 64%) 44%,
hsl(348deg 100% 67%) 49%,
hsl(358deg 100% 70%) 54%,
hsl(10deg 100% 68%) 58%,
hsl(19deg 100% 65%) 63%,
hsl(28deg 100% 63%) 69%,
hsl(35deg 100% 60%) 74%,
hsl(40deg 100% 58%) 80%,
hsl(45deg 100% 57%) 86%,
hsl(49deg 100% 57%) 93%,
hsl(55deg 93% 58%) 100%
);
--color-deck-trim: hsl(339deg 64% 96%);
--color-text: hsl(0deg 0% 99%);
--color-truck: hsl(45deg 0% 99%);
--color-wheel: hsl(352deg 100% 81%);
}
body:has([value="smiles"]:checked) {
--color-bolt: hsl(323deg 51% 55%);
--color-deck-1: hsl(45deg 98% 49%);
--color-deck-2: hsl(43deg 100% 40%);
--color-deck: linear-gradient(var(--color-deck-1) 60%, transparent 61%) 51%
77%/ 25vmin 5vmin no-repeat,
radial-gradient(var(--color-deck-2) 15%, transparent 16%) 51% 0%/ 20vmin 20vmin
no-repeat,
radial-gradient(var(--color-deck-2) 15%, transparent 16%) 61.4% 7%/ 9vmin 9vmin
no-repeat,
radial-gradient(var(--color-deck-2) 15%, transparent 16%)
var(--color-deck-1) 39% 7%/ 9vmin 9vmin no-repeat;
--color-deck-trim: hsl(0 20% 100%);
--color-text: hsl(43deg 100% 40%);
--color-truck: hsl(0deg 0% 64%);
--color-wheel: hsl(121deg 26% 39%);
}
body:has([value="pickle"]:checked) {
--color-bolt: hsl(145deg 78% 15%);
--color-border: hsl(145deg 78% 15%);
--color-deck: radial-gradient(hsl(145deg 78% 44%) 15%, transparent 16%)
0.25vmin 0 / 5vmin 5vmin,
radial-gradient(hsl(145deg 78% 50%) 15%, transparent 16%)
hsl(145deg 78% 44%) 0 0/ 5vmin 5vmin;
--color-deck-trim: hsl(0deg 20% 100%);
--color-text: hsl(145deg 78% 25%);
--color-truck: hsl(145deg 78% 70%);
--color-wheel: hsl(145deg 78% 29%);
}
body:has([value="png"]:checked) {
--color-bolt: hsl(0deg 0% 0%);
--color-deck: repeating-conic-gradient(white 0 90deg, lightgray 0 180deg) 0 0/5vmin
5vmin;
--color-deck-trim: hsl(0deg 20% 100%);
--color-text: hsl(0deg 0% 0%);
--color-truck: hsl(0deg 0% 84%);
--color-wheel: hsl(0deg 0% 15%);
}
body:has([value="debug"]:checked) {
--border-style: dashed;
--color-bolt: red;
--color-border: red;
--color-deck: transparent;
--color-deck-trim: transparent;
--color-text: red;
--color-truck: transparent;
--color-wheel: transparent;
}
* {
box-sizing: border-box;
}
html,
body {
height: 100%;
}
body {
display: grid;
grid-template-rows: auto 1fr auto;
place-items: center;
overflow: hidden;
font-family: system-ui;
transform-style: preserve-3d;
perspective: 600px;
cursor: grab;
transition: background-color 200ms ease-out;
}
body:active {
cursor: grabbing;
}
body:has([id="wild-mode"]:checked) {
background-color: papayawhip;
}
.header,
.footer {
display: flex;
align-items: center;
justify-content: center;
user-select: none;
padding: 1rem;
}
.header {
flex-wrap: wrap;
gap: 0.5rem;
}
.footer {
gap: 0.125rem;
bottom: 1rem;
left: 1rem;
justify-self: start;
}
.select {
--color-border: hsl(0 0% 70%);
position: relative;
display: grid;
grid-template-areas: "select";
align-items: center;
cursor: initial;
}
.select::after {
content: "";
grid-area: select;
justify-self: end;
margin-inline-end: 0.5rem;
width: 0.5em;
aspect-ratio: 16/9;
background-color: var(--color-border);
clip-path: polygon(100% 0%, 0 0%, 50% 100%);
}
.select select {
all: unset;
outline: revert;
grid-area: select;
background-color: hsl(0 0% 98%);
border: 1px solid var(--color-border);
border-radius: 0.25rem;
line-height: 1.2;
padding: 0.25rem 1.25rem 0.25rem 0.5rem;
}
[type="checkbox"] + label {
font-size: 0.8em;
}
.scene {
position: relative;
user-select: none;
font-size: 5vmin;
transform-style: preserve-3d;
transition: transform 600ms cubic-bezier(0.25, 1, 0.5, 1);
transform: rotateX(calc(var(--y) * -1deg)) rotateZ(calc(var(--x) / 2 * 1deg));
}
body:has([id="wild-mode"]:checked) .scene {
transform: translate3d(
calc(var(--x) / 2 * -1px),
calc(var(--y) / 2 * 1px),
calc(var(--y) * 1px)
)
rotateX(calc(var(--y) * -1deg)) rotateZ(calc(var(--x) * 1deg));
}
.board {
--padding: 1em;
position: relative;
display: flex;
gap: 0.75rem;
align-items: center;
justify-content: space-between;
padding: var(--padding) calc(var(--padding) * 2);
min-inline-size: 50vmin;
font-weight: bold;
color: var(--color-text);
background: var(--color-deck);
border-radius: 360px;
border: var(--border-size) var(--border-style) var(--color-border);
box-shadow: 0 0 0 var(--border-size) var(--color-deck-trim) inset;
transform-style: preserve-3d;
}
.board::before,
.board::after {
content: "::";
position: relative;
top: -0.085em;
color: var(--color-bolt);
}
.wheel {
--position: calc(var(--padding) * 2 - 0.15em);
position: absolute;
width: 0.8em;
aspect-ratio: 1;
background: var(--color-wheel);
border: inherit;
border-radius: 50%;
transform-origin: center;
transform: rotateX(-90deg) translateY(55%);
box-shadow: 0.3vmin -0.5vmin 0 hsl(0 0% 0% / 0.2) inset;
}
.wheel::before {
content: "";
position: absolute;
inset: 0;
margin: auto;
width: 15%;
aspect-ratio: 1;
border: inherit;
background: var(--color-deck);
border-radius: inherit;
}
.wheel:nth-of-type(1) {
top: 0;
left: var(--position);
}
.wheel:nth-of-type(2) {
top: 0;
right: var(--position);
}
.wheel:nth-of-type(3) {
bottom: 0;
left: var(--position);
}
.wheel:nth-of-type(4) {
bottom: 0;
right: var(--position);
}
.truck {
--offset: 0.1em;
position: absolute;
top: 50%;
width: 0.25em;
height: 70%;
background: var(--color-truck);
border-inline: calc(var(--border-size) / 2) var(--border-style)
var(--color-border);
box-shadow: -0.3vmin 0 0 hsl(0 0% 0% / 0.2) inset;
transform: translateY(-50%) rotateY(90deg) translateX(175%);
}
.truck::after {
content: "";
position: absolute;
top: 50%;
right: 0;
width: 100%;
height: 15%;
margin-inline: auto;
border-inline: inherit;
background-color: inherit;
box-shadow: -0.4vmin 0 0 hsl(0 0% 0% / 0.2) inset;
transform: translateY(-50%) rotate(-90deg) translateY(-64%);
}
.truck:nth-last-child(1) {
position: absolute;
left: calc(var(--padding) * 2 + var(--offset));
}
.truck:nth-last-child(2) {
position: absolute;
right: calc(var(--padding) * 2 + var(--offset));
}
.logo {
display: flex;
align-items: center;
position: absolute;
inset: 0;
left: -1em;
margin: auto;
width: 2em;
font-size: 0.5em;
color: var(--color-text);
transform: rotateX(180deg);
text-transform: uppercase;
backface-visibility: hidden;
}
.logo::before {
content: "";
position: absolute;
inset: 0;
left: -1.25vmin;
margin: auto;
width: 8.6vmin;
aspect-ratio: 1;
border: var(--border-size) var(--border-style) var(--color-text);
}
.logo::after {
position: absolute;
font-size: 1.75em;
font-weight: normal;
transform: translateY(-50%);
}
body:has([value="lightning"]:checked) .logo::after {
content: "";
top: 50%;
right: calc(130%);
width: 1.5em;
aspect-ratio: 1;
background: var(--color-text);
clip-path: polygon(50% 40%, 75% 40%, 40% 100%, 50% 60%, 25% 60%, 60% 0);
}
body:has([value="holiday"]:checked) .logo::after {
content: "❄\FE0E ❄\FE0E ❄\FE0E";
top: 50%;
right: 160%;
aspect-ratio: 1;
}
body:has([value="smiles"]:checked) .logo::after {
content: "";
width: 12vmin;
top: 45%;
left: -50%;
aspect-ratio: 1;
background: var(--color-deck-1);
z-index: -1;
}
.warning {
display: none;
}
@supports not (selector(:has(+ *))) {
strong {
font-weight: bold;
}
code {
position: relative;
top: -0.04em;
font-size: 1.1em;
font-family: "Courier", monospace;
}
.warning {
display: block;
flex: 1 0 100%;
font-size: 0.8em;
line-height: 1.2;
text-align: center;
background-color: papayawhip;
padding: 1rem;
border-radius: 0.25rem;
}
.footer {
display: none;
}
}
const root = document.documentElement;
const btnWildMode = document.getElementById("wild-mode");
function resetPropertyValues() {
root.style.setProperty("--x", 0);
root.style.setProperty("--y", 0);
}
Observer.create({
preventDefault: true,
onChangeX({ isDragging, deltaX }) {
if (!isDragging) return;
const x = root.style.getPropertyValue("--x");
root.style.setProperty("--x", parseInt(x) - deltaX);
},
onChangeY({ isDragging, deltaY }) {
if (!isDragging) return;
const y = root.style.getPropertyValue("--y");
root.style.setProperty("--y", parseInt(y) + deltaY);
}
});
btnWildMode.addEventListener("click", () => resetPropertyValues());
resetPropertyValues();
Also see: Tab Triggers