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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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Packages

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HTML 

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

CSS 

              
                // #divtober 26: Surprise
// a.singlediv.com/divtober2020

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

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

body
  min-height: 220px
  height: 100vh
  position: relative
  background-color: brown
  text-align: center

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

  &:before,
  &:after
    display: block
    content: ''
    position: absolute

#surprise
  width: 17em
  height: 10em
  margin-left: -(@width/2)
  margin-top: -(@height/2)
  background-repeat: no-repeat
  background-image: linear-gradient(cadetblue, cadetblue),
                    linear-gradient(gold, gold),
                    linear-gradient(darken(gold,10),darken(gold,10)),
                    linear-gradient(darken(gold,10),darken(gold,10)),
                    linear-gradient(darken(gold,10),darken(gold,10)),
                    radial-gradient(ellipse at 0 0, gold 54%,
                                                    alpha(gold,0) 55%),
                    radial-gradient(ellipse at 100% 0, gold 54%,
                                                       alpha(gold,0) 55%),
                    linear-gradient(gold, gold),
                    linear-gradient(gold, gold),
                    radial-gradient(ellipse at 100% 50%, darken(gold,10) 60%,
                                                         alpha(gold,0) 61%),
                    linear-gradient(gold, gold),
                    linear-gradient(gold, gold),
                    repeating-linear-gradient(to right, saddlebrown,
                                                        saddlebrown .5em,
                                                        sandybrown .5em,
                                                        sandybrown 1em),
                    repeating-linear-gradient(to right, sandybrown,
                                                        sandybrown .5em,
                                                        saddlebrown .5em,
                                                        saddlebrown 1em),
                    radial-gradient(circle, darkturquoise 60%, alpha(darkturquoise,0) 60.5%),
                    radial-gradient(circle, darkturquoise 60%, alpha(darkturquoise,0) 60.5%),
                    radial-gradient(circle, darkturquoise 60%, alpha(darkturquoise,0) 60.5%),
                    radial-gradient(circle, paleturquoise 54%,
                                            darkturquoise 54.5%,
                                            darkturquoise 60%,
                                            alpha(darkturquoise, 0) 60.5%),
                    linear-gradient(to bottom, gold .3em, saturation(darkslateblue,20) .3em)
  background-size: 10.9em 2em,
                   13em 3.8em,
                   2em 3.8em,
                   .6em 1em,
                   .6em 1em,
                   2.5em 1.5em,
                   2.5em 1.5em,
                   .6em 1em,
                   .6em 1em,
                   2em 4.9em,
                   .3em 5em,
                   .3em 5em,
                   3em 1em,
                   3em 1em,
                   .3em .3em,
                   .3em .3em,
                   .3em .3em,
                   6em 6em,
                   14em 5em
  background-position: right 1em bottom 1.9em,
                       right bottom 1em,
                       left 2em bottom 1em,
                       left 2em bottom,
                       left 3.4em bottom,
                       left 4em bottom,
                       right bottom,
                       left 4em bottom,
                       right bottom,
                       left bottom 4.45em,
                       left 2em bottom 4em,
                       right 1em bottom 4em,
                       left 3.8em bottom 4.2em,
                       left 3.8em bottom 4.6em,
                       left 4.2em bottom 6em,
                       left 5.1em bottom 6.8em,
                       left 5.5em bottom 5.8em,
                       left 2.5em bottom 2.2em,
                       left 2em bottom 4em

  &:before,
  &:after
    font-family: Myriad Pro, Helvetica, Arial
    font-weight: bold

  &:before
    content: 'TRY ME'
    width: 5em
    height: @width
    display: grid
    place-content: center
    right: .5em
    bottom: 3em
    background-repeat: no-repeat
    background-image: linear-gradient(-7deg, transparent 30%,
                                             gold 30%,
                                             gold 37%,
                                             transparent 37%),
                      repeating-linear-gradient(180deg, papayawhip,
                                                        papayawhip .2em,
                                                        white(0) .21em,
                                                        white(0) .4em),
                      repeating-linear-gradient( 90deg, papayawhip,
                                                        papayawhip .2em,
                                                        white(0) .21em,
                                                        white(0) .4em),
                      linear-gradient(-7deg, alpha(peachpuff,0) 37%,
                                             peachpuff 37%)
    background-size: 100% 100%,
                     100% 1em,
                     1em 70%,
                     100% 100%
    background-position: 0 0,
                         0 47%,
                         50% 0,
                         0 0
    border-radius: 50%
    color: mediumpurple
    transform: rotate(7deg)

  &:after
    font-size: 15px
    content: 'EAT ME'
    width: 6em
    height: 1.1em
    padding-top: 1.4em
    left: 6.8em
    top: 3.05em
    background-repeat: space repeat, no-repeat
    background-image: radial-gradient(circle, palevioletred 68%, alpha(palevioletred,0) 68.5%),
                      linear-gradient(palevioletred, palevioletred)
    background-size: .6em .6em,
                     5.5em 2.5em
    background-position: 50% 0,
                         50% .25em
    color: pink
    text-align: center
!

JS 

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

Console