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CSS

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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

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JavaScript

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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 class="splash">
  <div class="splash_logo">
    BJL
  </div>
  <div class="splash_svg">
    <svg width="100%" height="100%">
      <rect width="100%" height="100%" >
	  </svg>
  </div>
  <div class="splash_minimize">
    <svg width="100%" height="100%">
      <rect width="100%" height="100%" >
	  </svg>
  </div>
</div>
<div class="text">
  <p>Duis quis</p>
  <p>nec sapien</p>
  <button>More</button>
</div>
!

CSS 

              
                @mixin animation($animate...) {
  $max: length($animate);
  $animations: '';
  @for $i from 1 through $max {
    $animations: #{$animations + nth($animate, $i)};
    @if $i < $max {
      $animations: #{$animations + ", "};
    }
  }
  -webkit-animation: $animations;
  -moz-animation: $animations;
  -o-animation: $animations;
  animation: $animations;
}

@mixin transition($args...) {
  -webkit-transition: $args;
  -moz-transition: $args;
  -ms-transition: $args;
  -o-transition: $args;
  transition: $args;
}

@mixin keyframes($animationName) {
  @-webkit-keyframes #{$animationName} {
    @content;
  }
  @-moz-keyframes #{$animationName} {
    @content;
  }
  @-o-keyframes #{$animationName} {
    @content;
  }
  @keyframes #{$animationName} {
    @content;
  }
}

//theme
$yellow:#f5d300;
$black: #292929;
$bg: #191919;
$lines: #757474;
body {
  background-color: $bg;
  font-family: 'Open Sans', sans-serif;
}

.text {
  opacity: 0;
  position: absolute;
  z-index: 7;
  text-align: left;
  margin: -50px 0 0 -150px;
  width: 300px;
  height: 100px;
  top: 50%;
  left: 50%;
  font-size: 48px;
  font-weight: 700;
  p {
    white-space: nowrap;
    overflow: hidden;
    width: 100%;
    @include animation('type .3s steps(60, end) 3.7s');
  }
  p:nth-child(2) {
    @include animation('type2 .5s steps(60, end) 3.7s');
  }
  @include animation('on .6s ease-in-out 3.7s forwards');
  
  button {
    border:0;
    opacity:0;
    background:$bg;
    color:$yellow;
    border:1px solid $bg;
    letter-spacing:2px;
    padding:.5rem 2.5rem;
    font-size:12px;
    font-weight:600;
    text-transform:uppercase;
    cursor:pointer;
    @include transition(color .5s, background-color .5s);
    @include animation('on .6s ease-in-out 4s forwards');
    &:hover {
      background:$yellow;
      color:$bg;
      border:1px solid $bg;
    }
  }
}

.splash {
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  overflow: hidden;
  &_logo {
    position: absolute;
    margin: -15px 0 0 -25px;
    top: 50vh;
    z-index: 5;
    left: 50vw;
    width: 50px;
    text-align: center;
    height: 30px;
    font-size: 26px;
    font-weight: 600;
    color: #ffffff;
    opacity: 1;
    will-change: opacity;
    @include animation('logo .3s ease-in 1.5s forwards, off .6s ease-in-out 3.2s forwards');
    &:before {
      display: block;
      position: absolute;
      left: 15px;
      bottom: -5px;
      width: 20px;
      height: 1px;
      background-color: $lines;
      content: "";
    }
    &:after {
      display: block;
      position: absolute;
      left: 15px;
      top: -5px;
      width: 20px;
      height: 1px;
      background-color: $lines;
      content: "";
      will-change: width;
    }
  }
  &_svg {
    position: relative;
    margin: auto;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    bottom: 0;
    right: 0;
    svg {
      width: 100%;
      height: 100%;
      -webkit-backface-visibility: visible;
      backface-visibility: visible;
      rect {
        width: 100%;
        height: 100%;
        fill: $yellow;
        stroke: 0;
        -webkit-clip-path: polygon(45vw 40vh, 55vw 40vh, 55vw 60vh, 45vw 60vh);
        clip-path: polygon(45vw 40vh, 55vw 40vh, 55vw 60vh, 45vw 60vh);
        @include animation('expand .7s ease-in forwards 2.7s');
      }
    }
  }
  &_minimize {
    position: absolute;
    margin: auto;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 4;
    svg {
      width: 100%;
      height: 100%;
      -webkit-backface-visibility: visible;
      backface-visibility: visible;
      rect {
        width: 100%;
        height: 100%;
        -webkit-clip-path: polygon(0vw 0vh, 100vw 0vh, 100vw 100vh, 0vw 100vh);
        clip-path: polygon(0vw 0vh, 100vw 0vh, 100vw 100vh, 0vw 100vh);
        @include animation('scale .2s ease-out forwards 1s, hide 1.3s ease-out forwards 1.2s');
      }
    }
  }
}

@include keyframes(scale) {
  100% {
    -webkit-clip-path: polygon(45vw 40vh, 55vw 40vh, 55vw 60vh, 45vw 60vh);
    clip-path: polygon(45vw 40vh, 55vw 40vh, 55vw 60vh, 45vw 60vh);
  }
}

@include keyframes(hide) {
  100% {
    fill: transparent;
  }
}

@include keyframes (off) {
  100% {
    opacity: 0;
  }
}

@include keyframes (on) {
  100% {
    opacity: 1;
  }
}

@include keyframes (logo) {
  100% {
    color: $black;
  }
}

@include keyframes (type) {
  0% {
    width: 0;
  }
}

@include keyframes (type2) {
  0% {
    width: 0;
  }
  50% {
    width: 0;
  }
  100% {
    width: 100;
  }
}

@include keyframes(expand) {
  0% {}
  25% {
    -webkit-clip-path: polygon(0vw 0vh, 55vw 40vh, 55vw 58vh, 45vw 58vh);
    clip-path: polygon(0vw 0vh, 55vw 40vh, 55vw 60vh, 45vw 60vh);
    fill: white;
  }
  50% {
    -webkit-clip-path: polygon(0vw 0vh, 100vw 0vh, 55vw 60vh, 45vw 60vh);
    clip-path: polygon(0vw 0vh, 100vw 0vh, 55vw 60vh, 45vw 60vh);
    fill: $yellow;
  }
  75% {
    -webkit-clip-path: polygon(0vw 0vh, 100vw 0vh, 55vw 60vh, 0vw 100vh);
    clip-path: polygon(0vw 0vh, 100vw 0vh, 55vw 60vh, 0vw 100vh);
    fill: white;
  }
  100% {
    -webkit-clip-path: polygon(0vw 0vh, 100vw 0vh, 100vw 100vh, 0vw 100vh);
    clip-path: polygon(0vw 0vh, 100vw 0vh, 100vw 100vh, 0vw 100vh);
    fill: $yellow;
  }
}
!

JS
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