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.
<div class="entry sully"></div>
black(alpha)
rgba(0,0,0,alpha)
white(alpha)
rgba(255,255,255,alpha)
turq(alpha)
rgba(0,206,209,alpha)
purp(alpha)
rgba(147,112,219,alpha)
body
background-color: paleturquoise
position: relative
height: 100vh
.entry
position: absolute
left: 50%
top: 50%
&:before,
&:after
display: block
content: ''
position: absolute
&.sully
width: 160px
height: 62px
margin-left: -(@width/2)
margin-top: -150px
background: transparent
border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%
box-shadow: 0 7px 7px 3px bisque,
0 15px 0 10px black(.25),
0 15px 0 10px bisque
&:before
width: 180px
height: 230px
margin-left: -(@width/2)
top: 30px
left: 50%
background-color: darkturquoise
background-image: radial-gradient(ellipse, black(.4) 50%, transparent 50%),
radial-gradient(ellipse, black(.4) 50%, transparent 50%),
radial-gradient(ellipse, darken(darkturquoise,20) 50%, transparent 50%), // nose
radial-gradient(circle, white 50%, transparent 50%), // left eye
radial-gradient(circle, #444 50%, transparent 50%),
radial-gradient(circle, mediumpurple 30%,
purp(0) 70%),
radial-gradient(circle, #444 50%, transparent 50%),
radial-gradient(ellipse, white 30%,
#ddd 60%,
transparent 60%),
radial-gradient(ellipse, #333 45%,
mediumturquoise 55%,
mediumturquoise 60%,
transparent 60%),
radial-gradient(circle, white 50%, transparent 50%), // right eye
radial-gradient(circle, #444 50%, transparent 50%),
radial-gradient(circle, mediumpurple 30%,
purp(0) 70%),
radial-gradient(circle, #444 50%, transparent 50%),
radial-gradient(ellipse, white 30%,
#ddd 60%,
transparent 60%),
radial-gradient(ellipse, #333 45%,
mediumturquoise 55%,
mediumturquoise 60%,
transparent 60%),
radial-gradient(ellipse, darken(darkturquoise,7) 40%, turq(0) 50%), // nose shadow
radial-gradient(ellipse, darken(darkturquoise,10) 40%, turq(0) 50%), // eye shadow
radial-gradient(ellipse, mediumpurple 30%, purp(0) 60%), // purple spots
radial-gradient(ellipse, mediumpurple 30%, purp(0) 60%),
radial-gradient(circle, turq(0) 35%, darken(darkturquoise,10) 65%) // shadow
background-repeat: no-repeat
background-size: 20px 10px,
20px 10px,
75px 40px,
5px 5px, // left eye
13px 13px,
19px 19px,
34px 34px,
50px 45px,
54px 58px,
5px 5px, // right eye
13px 13px,
19px 19px,
34px 34px,
50px 45px,
54px 58px,
100px 40px, // nose shadow
170px 90px, // eye shadow
45px 40px, // purple spots
45px 40px,
220px 350px // shadow
background-position: 70px 118px,
90px 118px,
center 95px,
68px 70px, // left eye
60px 71px,
58px 68px,
50px 60px,
40px 55px,
38px 47px,
114px 70px, // right eye
106px 71px,
102px 68px,
95px 60px,
90px 55px,
88px 47px,
center 90px, // nose shadow
center 30px, // eye shadow
50px -17px, // purple spots
95px 10px,
0 -80px // shadow
border-radius: 50% 50% 50% 50% / 60% 60% 30% 30%
box-shadow: 0 0 20px darken(darkturquoise,10),
0 10px 10px darken(darkturquoise,15),
inset 0 -15px 0 13px black(.03)
@media (max-width: 400px)
margin-top: -122px
&:after
width: 70px
height: 15px
margin-left: -(@width/2)
left: 50%
top: 180px
background: #444
background-image: radial-gradient(ellipse, white 50%, transparent 50%),
radial-gradient(ellipse, white 50%, transparent 50%),
radial-gradient(ellipse, white 50%, transparent 50%),
radial-gradient(ellipse, white 50%, transparent 50%),
radial-gradient(ellipse, white 50%, transparent 50%),
radial-gradient(ellipse, white 50%, transparent 50%)
background-repeat: no-repeat
background-size: 16px 25px
background-position: -5px 7px,
7px 4px,
19px 7px,
31px 7px,
43px 4px,
55px 7px
border-radius: 60% 60% 40% 40% / 50% 50% 50% 50%
box-shadow: 0 6px 0 mediumturquoise,
0 15px 3px -4px darken(darkturquoise,10),
0 -106px 6px -2px white(.2),
-20px -114px 6px 7px darken(darkturquoise,7),
20px -114px 6px 7px darken(darkturquoise,7),
-20px -105px 5px 5px black(.15),
20px -105px 5px 5px black(.15)
Also see: Tab Triggers