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HTML

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About the <head>

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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

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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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HTML 

              
                <div id="boxed"></div>
!

CSS 

              
                // #divtober 03: Boxed
// a.singlediv.com/divtober2020

black(alpha)
  rgba(0,0,0,alpha)

white(alpha)
  rgba(255,255,255,alpha)

body
  min-height: 400px
  height: 100vh
  position: relative
  background-color: #fcf7f5
  text-align: center

div
  position: absolute
  left: 50%
  top: 50%

  &:before,
  &:after
    display: block
    content: ''
    position: absolute
    
  @media (max-width: 400px)
    &:not(.no-scale)
      transform: scale(.8)

#boxed
  width: 350px
  height: 300px
  margin-left: -(@width/2)
  margin-top: -(@height/2)
  background-repeat: no-repeat
  background-image: radial-gradient(circle, hotpink 60%, transparent 60.1%), // peanuts
                    radial-gradient(circle, pink 60%, transparent 60.1%),
                    radial-gradient(circle, hotpink 60%, transparent 60.1%),
                    radial-gradient(circle, hotpink 60%, transparent 60.1%),
                    radial-gradient(circle, hotpink 60%, transparent 60.1%),
                    radial-gradient(circle, hotpink 60%, transparent 60.1%),
                    radial-gradient(circle, pink 60%, transparent 60.1%),
                    radial-gradient(circle, hotpink 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%), // cloud
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%), // cloud
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(circle, white 60%, transparent 60.1%),
                    radial-gradient(ellipse at 50% 80%, transparent 35%,
                                                        mediumpurple 35.2%,
                                                        mediumpurple 40%,
                                                        darkturquoise 40.2%,
                                                        darkturquoise 45%,
                                                        mediumseagreen 45.2%,
                                                        mediumseagreen 50%,
                                                        orange 50.2%,
                                                        orange 55%,
                                                        lighten(crimson,10) 55.2%,
                                                        lighten(crimson,10) 60%,
                                                        transparent 60.2%),
                    radial-gradient(circle, gold 60%, transparent 60.1%),
                    linear-gradient(orange, orange),
                    linear-gradient(orange, orange),
                    linear-gradient(mediumpurple, mediumpurple),
                    linear-gradient(mediumpurple, mediumpurple),
                    linear-gradient(mediumseagreen, mediumseagreen),
                    linear-gradient(mediumseagreen, mediumseagreen),
                    linear-gradient(orange, orange),
                    linear-gradient(orange, orange)
  background-size: 30px 30px, // peanuts
                   50px 50px,
                   40px 40px,
                   30px 30px,
                   30px 30px,
                   50px 50px,
                   40px 40px,
                   30px 30px,
                   20px 20px, // cloud
                   40px 40px,
                   30px 30px,
                   30px 30px,
                   20px 20px,
                   20px 20px, // cloud
                   35px 35px,
                   20px 20px,
                   25px 25px,
                   20px 20px,
                   95% 100%, // rainbow
                   60px 60px, // sun
                   21px 5px, 5px 21px,
                   21px 5px, 5px 21px,
                   21px 5px, 5px 21px,
                   21px 5px, 5px 21px
  background-position:  left 15px bottom 60px, // peanuts
                        left 32px bottom 53px,
                        left 65px bottom 54px,
                        left 95px bottom 60px,
                       right 15px bottom 60px,
                       right 32px bottom 53px,
                       right 65px bottom 54px,
                       right 95px bottom 60px,
                        72px 100px, // cloud
                        82px  80px,
                       110px  90px,
                        82px 100px,
                       105px 105px,
                       right  50px top 150px, // cloud
                       right  60px top 140px,
                       right  85px top 155px,
                       right  70px top 160px,
                       right  55px top 160px,
                       50% 0, // rainbow
                       right 20px top, // sun
                       0 148px, 8px 140px,
                       70px 35px, 78px 27px,
                       140px 180px, 148px 172px,
                       right 10px top 115px, right 18px top 107px

  &:before,
  &:after
    font-family: Helvetica, Arial, sans-erif
    font-weight: bold
    text-transform: uppercase
    font-size: 11px
    color: #222
    height: 30px
    padding-top: 50px
    bottom: 0
    background-repeat: no-repeat
    background-size: 33% 30%,
                     33% 40%,
                     70% 30%,
                     60% 40%,
                     112px 100%
    box-shadow: 0 15px 0 -13px sienna

  &:before
    content: 'design'
    text-align: right
    width: 110px
    padding-right: 35px
    background-image: linear-gradient(120deg, transparent     21%,
                                              darken(peru,10) 21.5%,
                                              darken(peru,10) 78%,
                                              transparent     78.5%),
                      linear-gradient(110deg, darken(peru,23) 55%,
                                              transparent     55.5%),
                      linear-gradient( 55deg, transparent     18%,
                                              peru  18.5%,
                                              peru  85%,
                                              transparent     85.5%),
                      linear-gradient( 70deg, transparent     19%,
                                              darken(peru,15) 19.5%),
                      linear-gradient(to right, darken(peru,15) 29%, lighten(peru,5) 29%)
    background-position: 0 0,
                         15px 0,
                         100% 0,
                         right 18px top 0,
                         15px 0

  &:after
    content: 'code'
    text-align: left
    width: 105px
    padding-left: 40px
    right: 0
    background-image: linear-gradient(-120deg, transparent     21%,
                                               darken(peru,10) 21.5%,
                                               darken(peru,10) 78%,
                                               transparent     78.5%),
                      linear-gradient(-110deg, darken(peru,23) 55%,
                                               transparent     55.5%),
                      linear-gradient( -55deg, transparent     18%,
                                               peru  18.5%,
                                               peru  85%,
                                               transparent     85.5%),
                      linear-gradient( -70deg, transparent     19%,
                                              darken(peru,15) 19.5%),
                      linear-gradient(to left, darken(peru,15) 29%, lighten(peru,5) 29%)
    background-position: 100% 0,
                         right 15px top 0,
                         0 0,
                         left 18px top 0,
                         right 15px top 0
!

JS 

              
                // @lynnandtonic
// a.singlediv.com
!
999px

Console