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HTML

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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.

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Insecure Resource

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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

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-.

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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 

              
                .moon

ul.clouds
  - let cloud = 3;
  while (cloud--)
    li.cloud

ul.grasses
  - let grass = 200
  while (grass--)
   li.grass

.pokeball-container
  .reflection
    
ul.stars
  - let star = 75
  while (star--)
   li.star
!

CSS 

              
                $red: #ee262e;
$white: #f8f8f8;
$black: #353536;
$blue: #3046a7;
$green: #017740;

body {
  height: 100vh;
  background: $blue;
  overflow: hidden;
}

ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

.moon {
  width: 30vw;
  height: 30vw;
  background: $white;
  position: absolute;
  right: -15vw;
  top: -15vw;
  border-radius: 50%;
  box-shadow: 0 0 10px 2px rgba($white, 0.5);
  
  animation: bright 10s infinite;
  
  @keyframes bright {
    0%, 100% {
      box-shadow: 0 0 10px 2px rgba($white, 0.5);
    }
    50% {
      box-shadow: 0 0 0 0 rgba($white, 0.5);
    }
  }
  
  &:before,
  &:after {
    content: '';
    display: block;
    background: rgba(darken($white, 30%), 0.4);
    position: absolute;
    border-radius: 50%;
  }
  
  &:before {
    left: 15%;
    top: 45%;
    width: 10%;
    height: 10%;
  }
  
  &:after {
    left: 6%;
    top: 56%;
    width: 15%;
    height: 15%;
  }
}

.clouds {
  position: absolute;
  left: 0;
  top: 0;
  width: 85vw;
  height: 80vh;
  
  @media (max-width: 800px) {
    display: none;
  }
}
.cloud {
  width: 20vw;
  height: 10vh;
  background: $white;
  border-radius: 40px;
  opacity: 0.8;
  position: absolute;
  
  animation: move 50s infinite;
  
  @keyframes move {
    0%, 100% {
      margin-left: 0;
    }
    50% {
      margin-left: -10%;
    }
  }
  
  &:before,
  &:after {
    content: '';
    display: block;
    background: $white;
    border-radius: 50px;
    position: absolute;
    height: 80%;
    bottom: 65%;
  }
  
  &:before {
    width: 38%;
    left: 20%;
    bottom: 65%;
  }
  
  &:after {
    width: 35%;
    right: 10%;
    bottom: 60%;
  }
  
  &:nth-child(1) {
    top: 15%;
    left: 15%;
  }
  
  &:nth-child(2) {
    top: 70%;
    left: 90%;
  }
  
  &:nth-child(3) {
    top: 5%;
    left: 77%;
  }
}

.stars {
  width: 100%;
  height: 75vh;
  position: absolute;
  left: 0;
  top: 0;
}
.star {
  display: block;
  background: $white;
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  
  animation: star 1s 0s linear;
  
  @keyframes star {
    0%, 100% {
      background: $white;
    }
    30% {
      background: rgba($white, 0.1)
    }
  }
  
  @for $i from 1 through 75 {
    &:nth-child(#{$i}) {
      $size: unquote(random(10) + 'px');
      width: $size;
      height: $size;
      top: unquote(random(100) + '%');
      left: unquote(random(100) + '%');
      animation-delay: unquote($i + 's');
    }
  }
}

.grasses {
  width: 100%;
  height: 20vh;
  background: $green;
  position: absolute;
  left: 0;
  bottom: 0;
  
  &:before {
    content: '';
    width: 150px;
    height: 60px;
    background: rgba($black, 0.8);
    position: absolute;
    bottom: calc(20vh - 60px);
    left: 0;
    right: 0;
    margin: 0 auto;
    border-radius: 50%;
  
    animation: shadow 2s infinite;
  
    @keyframes shadow {
      20%, 40%, 50% {
        width: 150px;
        height: 60px;
        bottom: calc(20vh - 60px);
      }
      30% {
        width: 100px;
        height: 30px;
        bottom: calc(20vh - 30px);
      }
    }
  }
}
.grass {
    display: block;
    background: darken($green, 10%);
    position: absolute;
    border-radius: 10px 0; 
    
    @for $i from 1 through 200 {
      &:nth-child(#{$i}) {
        $size: unquote(random(10) + 'px');
        width: $size;
        height: $size;
        top: unquote(random(100) + '%');
        left: unquote(random(100) + '%');
        animation-delay: unquote(random(100) + 's');
        transform: rotate(unquote(random(360) + 'deg'));
      }
    }
  }

.pokeball-container {
  position: absolute;
  width: 250px;
  height: 250px;
  margin: 0 auto;
  border: 4px solid $black;
  border-radius: 50%;
  left: 0;
  right: 0;
  bottom: 17vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    to bottom,
    $red 0,
    $red 47%,
    $black 47%,
    $black 55%,
    $white 55%,
    $white 100%
  );
  
  animation: twist 2s infinite;
  
  @keyframes twist {
    20%, 40%, 50% {
      bottom: 17vh;
      transform: none;
    }
    30% {
      bottom: 20vh;
    }
    43% {
      transform: rotate(-10deg);
    }
    47% {
      transform: rotate(10deg);
    }
  }
  
  &:before,
  &:after{
    content: '';
    display: block;
    background: $white;
    border: 2px solid $black;
    border-radius: 50%;
    position: absolute;
  }
  
  &:before {
    width: 20%;
    height: 20%;
    box-shadow: 0 0 4px 1px rgba($black, 0.3);
  }
  
  &:after {
    width: 7.5%;
    height: 7.5%;
    
    animation: blink 1s infinite;
    
    @keyframes blink {
      50% {
        background: rgba($red, 0.7)
      }
    }
  }
}
.reflection {
  width: 25px; 
  height: 20px;  
  border: solid 5px white;
  border-color: transparent transparent transparent rgba(lighten($red, 80%), 0.3);
  border-radius: 20px 0 0 50%/20px;
  position: absolute;
  transform: rotate(140deg);
  right: 18%;
  top: 15%;
}
!

JS
!
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