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.
About the <head>
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.
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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.
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.
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-.
We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).
Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.
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.
If the stylesheet 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 CSS 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.
@import "nib"
body
font-size 14px
font-family Sans-Serif
*
box-sizing border-box
a
text-decoration none
.blurImg
position relative
width 100%
height 440px
z-index -1
top 0
left 0
& > div
position fixed
width 100%
height 440px
background-repeat no-repeat
background-size cover
background-position center center
.blur
opacity 0
header
z-index 1
position absolute
top 0
width 100%
padding 0px 20px
& > div
max-width 600px
margin 0 auto
padding-top 150px
height 380px
text-align center
color White
a
font-size 0.8em
letter-spacing 0.08em
color rgba(255,255,255,0.85)
line-height 30px
padding 7px 14px
border 1px solid rgba(255,255,255,0.3)
border-radius 2em
transition all 0.3s ease
&:hover
background white
color Gray
p
font-size 1.5em
margin-bottom 0.7em
font-family Times New Roman
h1
font-weight 800
font-size 3.4em
margin-bottom 0.2em
nav
max-width 600px
margin 0 auto
height 60px
border-top 1px rgba(255,255,255,0.35) solid
ul
li
display inline-block
margin-right 20px
a
font-weight 800
font-size 11px
text-transform uppercase
letter-spacing .2em
color rgba(255,255,255,0.5)
transition color 0.3s linear
line-height 60px
display block
&.active
box-shadow 0px -1px 0px white
nav ul li a.active, nav ul li a:hover
color white
.container
height 1300px
background white
z-index 1
padding 0px 20px
div
max-width 600px
margin 0 auto
padding-top 40px
