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.
h1 Photoshop images with CSS blend-modes
.content__intro
h2 Intro
.description
p Before I learned how to write "the codez" I was a photographer. In photoshop, there are 3 simple techniques to lighten, darken and colorize images quickly. Now we can do these same techniques with CSS.
.content__lighten
h2 Lighten a dark image
.description
h3 (under exposure)
p Sometimes you get a dark image and you wish you could lighten it. Well you can—using the same quick method you'd use in photoshop. Just duplicate the layer and set it's blend mode to screen.
.media-1
.description
p Below I took the exact same image and gave it multiple backgrounds of itself. I know, this sounds weird, but you can totally create multiple background images in CSS.
pre
code background-image: url(photo-1.jpg), url(photo-2.jpg)
p We can then lighten that image by adding:
pre
code background-blend-mode: screen
p In this case, I did three layers of the same image to make the effect stronger. You can add as many layers as you'd like.
.media-2
.description
p
a(href='https://500px.com/photo/109516309/giml%C3%A9-by-stian-klo?from=popular') Source image
.content__darken
h2 Darken a light image
.description
h3 (over exposure)
p Sometimes you get a light image and you wish that you could darken it. We can do that using the inverse of the method above.
.media-1
.description
p Again, we use the multiple background trick to make 2 layers of the same image. Then we set:
pre
code background-blend-mode: multiply
p Boom! Done. Darkening accomplished.
.media-2
.description
p
a(href='https://500px.com/photo/4597826/rachel-by-molly-thompson') Source image
.content__colorize
h2 Colorizing 1
.description
p Sometimes you just want to make an image look cool. Maybe you want to colorize an image to set text over it. Regardless, colorizing is easy.
.media-1
.description
p This time we use one image and a background color:
pre
code
| background-image: url(image.jpg)
| background-color: #0fc
| background-blend-mode: multiply
.media-2
.description
p Below we use a "screen" blend mode:
pre
code
| background-image: url(image.jpg)
| background-color: tomato
| background-blend-mode: screen
.media-3
.description
p Bleow we use an image with a "linear-gradient" background as a second image
pre
code
| background-image: url(image/jpg), linear-gradient(135deg, red, blue)
| background-blend-mode: overlay
.media-4
.description
p Bleow is another, but using "hard-light" instead.
pre
code
| background-image: url(image.jpg), linear-gradient(45deg, red, green, blue)
| background-position: center center
| background-blend-mode: hard-light
.media-5
.description
p
a(href='https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2') Source image
.content__bw
h2 Colorizing 2
.description
h3 (Black and White)
p You can also turn a color image to a black-and-white image too, but the technique is a little different.
.media-1
.description
p This time we use a pseudo-element to place a background color over the image.
pre
code
| &::after
| content: ''
| position: absolute
| top: 0
| left: 0
| background-color: #ccc
| width: 100%
| height: 100%
| mix-blend-mode: color
p You can use this technique to create any monotone image.
.media-2
.description
p
a(href='https://500px.com/photo/109802031/focus-result-(b-)-by-marc-buys') Source image
.content__outtro
h2 Outtro
.description
p I could do this forever. There are so many options. I'd argue that the most usable blend-modes are multiply, screen, overlay, soft-light, hard-light and color.
p If you use a background-image and background-color on the same element, the image will alway sit on top. The blend mode is applied top down. Thus, the image ends, up with the blend-mode.
p To make some blend modes work, you need to place the background-color over the background-image. This requires using an absolutely positioned pseudo-element to sit on top of the image. We will also need to use "mix-blend-mode" instead of "background-blend-mode."
h3 Important note!
p While most of the exmaples in this pen used background images with blend-modes, you can use the technique in Colorize 2 to apply blend-modes to img tags. Just put a pseudo-element over the img and use "mix-blend-mode."
h3 500px
p
| All the photos came from 500px. None of them are mine, but you can peep my photos at my
|
a(href="https://500px.com/benjamingandhi-shepard") 500px
| account.
h3 Jade and Stylus
p Don't be intimidated by Jade and Stylus. Just click the new "View Compiled" buttons in the code window to get the compiled source codez! You can then convert them into whatever you want (css to LESS or css to scss)
*
box-sizing border-box
:root
font-size 18px
body
background-color #fc0
color #333
font-family source sans pro
font-weight 200
line-height 1.25
margin-top 2rem
h1
font-size 8vw
font-weight 900
padding 1rem
text-align center
text-shadow 5px 5px 0 rgba(100,100,100, 0.4)
text-transform uppercase
h2
font-size 5vw
font-weight 600
position relative
text-align center
text-shadow 5px 5px 0 #eee
text-transform uppercase
&::after
border-bottom 5px solid #333
bottom -1rem
content: ''
left 50%
position absolute
transform translateX(-50%)
width 6rem
h3
font-family source sans pro
font-size 2vw
font-weight 200
padding 3rem 0 0 0
text-align center
.description
p
font-family source serif pro
line-height 1.5
margin 2rem 0
padding 0 6rem
[class^=content]
background-color white
box-shadow 10px 10px 0 rgba(100,100,100, 0.2)
margin 4rem auto
padding 2rem
width 80vmax
[class^=media]
background-position center center
background-repeat no-repeat
background-size cover
height 50vh
width 100%
.content
&__lighten
.media-1
background-image: url(https://drscdn.500px.org/photo/109516309/m%3D2048/c1b43253d5d2f8e48c211f544672949d)
.media-2
background-image: url(https://drscdn.500px.org/photo/109516309/m%3D2048/c1b43253d5d2f8e48c211f544672949d), url(https://drscdn.500px.org/photo/109516309/m%3D2048/c1b43253d5d2f8e48c211f544672949d), url(https://drscdn.500px.org/photo/109516309/m%3D2048/c1b43253d5d2f8e48c211f544672949d)
background-blend-mode screen
&__darken
.media-1
background-image: url(https://drscdn.500px.org/photo/4597826/m%3D2048/04c42fa661e7a2d66a99cdada44dc03c)
.media-2
background-image: url(https://drscdn.500px.org/photo/4597826/m%3D2048/04c42fa661e7a2d66a99cdada44dc03c), url(https://drscdn.500px.org/photo/4597826/m%3D2048/04c42fa661e7a2d66a99cdada44dc03c)
background-blend-mode multiply
&__colorize
.media-1
background-image: url(https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2)
.media-2
background-image: url(https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2)
background-color #0fc
background-blend-mode: multiply
.media-3
background-image: url(https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2)
background-color tomato
background-blend-mode: overlay
.media-4
background-image: url(https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2), linear-gradient(135deg, red, blue)
background-blend-mode: overlay
display flex
align-items center
justify-content center
&::after
color white
content: 'Elutheria'
font-family source sans pro
font-size 5rem
font-weight 200
/*position absolute
top center
left center*/
text-transform uppercase
.media-5
background-image url(https://drscdn.500px.org/photo/63285587/m%3D2048/5b76fef38d86247ba8a99007d61df3a2), linear-gradient(45deg, red, green, blue)
background-position 50% 50%
background-blend-mode hard-light
&__bw
.media-1
background-image: url(https://drscdn.500px.org/photo/109802031/m%3D1170/06b0b6ff2b8533c1f952fe8661abba56)
.media-2
background-image: url(https://drscdn.500px.org/photo/109802031/m%3D1170/06b0b6ff2b8533c1f952fe8661abba56)
position relative
&::after
content: ''
position absolute
top 0
left 0
background-color #ccc
width 100%
height 100%
mix-blend-mode color
pre
background-color #333
color #eee
display block
font-family source code pro
padding 1rem
white-space pre-wrap
a
background-color #fc0
color #333
display inline-block
padding 0 .5rem
text-decoration none
&:hover
background-color #333
color #fc0
Also see: Tab Triggers