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CSS

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HTML 

              
                mixin ghc
 a.github-corner(href='//github.com/meodai/color-names', target='_blank', aria-label='View source on Github')
  svg(width='80', height='80', viewbox='0 0 250 250', aria-hidden='true')
    path.triange(d='M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z')
    path.octo-arm(d='M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2', style='transform-origin: 130px 106px;')
    path.octo-body(d='M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z')
 
h1.loading Loading Names
  

.js-app.is-hidden
  +ghc
  style :root { --color-bg: {{currentColor.value}}; --color-contrast: {{currentColor.contrastValue}}; }
  
  div.background
    .inner
      .logo.
      input(type='color' @input='update')
      .header
        h1 {{currentColor.name}}
        h2: input(type='text' @input='update' ':value'='currentColor.value' spellcheck=false)
        -// span(':style'='{color: currentColor.nameValue}') ◑
!

CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Space+Mono:400';



:root {
  --color-bg: #fff;
  --color-contrast: #000;
  --bezel: 4vmin;
}

body {
  background: var(--color-contrast);
  &::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(#fff,.15);
  }
}

.loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}

html, body {
  min-height: 100%;
}

html, body, input {
  font-family: 'Space Mono', ipm, Menlo, 'Courier New', monospace;
  font-size: calc(1vmin + .75rem);
  
  &, h1, h2 {
    font-weight: 400;
  }
}

input {
  appearance: none;
  border: none;
  padding: 0;
  margin: 0;
  background: none;
  color: currentColor;
  &[type='text'] {
    &:focus {
      outline: none;
    }
  }
}

.js-app {
  transition: opacity 400ms, visibility 400ms;
  background-color: var(--color-bg);
}

h2 {
  clip-path: inset(0 0 0 0);
  transition: 400ms clip-path cubic-bezier(.7,.25,0,1) 1000ms;
}

.logo {
  transition: 333ms transform cubic-bezier(.7,.3,.25,1.15);
  //transform: rotate(180deg) translateY(20%) translateZ(0);
  transform-origin: 50% 50%;
  pointer-events: none;
}

.background {
  position: fixed;
  top: 50%; left: 50%;
  width: 70vh;
  max-width: 90%;
  height: 90vh;
  transform: translate(-50%,-50%);
  background-color: var(--color-bg);
  &::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    box-shadow: 0 0 4rem var(--color-bg);
    pointer-events: none;
    transform: scale(.9) translateY(2vmin);
  }
}
.logo {
  svg {
    width: 6rem;
    height: auto;
    transition: 640ms transform cubic-bezier(.7,.3,.25,1.15) 200ms, 500ms opacity linear 240ms;
    transform: scale(1) rotate(0deg);
    path {
      fill: currentColor;
    }
  }
}


.header {
  position: absolute;
  bottom: -1px; left: -1px; right: -1px;
  padding: calc(var(--bezel) * .75) var(--bezel) var(--bezel);
  background-color: var(--color-contrast);
  color: var(--color-bg);
}

.inner {
  h1 {
    position: relative;
    margin: 0 0 .6rem 0;
  }
  h2 {
    margin: 0;
    font-size: 1rem;
    span {
      display: none;
    }
  }
  input[type='color'],
  input[type='button'] {
    cursor: pointer;
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: 100%; height: auto;
    opacity: 0;
  }
}

.is-hidden {
  visibility: hidden;
  opacity: 0;
  .background {
    box-shadow: inset 0 0 0 0 currentColor;
  }
  .logo svg {
    opacity: 0;
    transform: scale(0.15) rotate(-280deg);
  }
  h2 {
    clip-path: inset(0 0 100% 0);
  }
  .github-corner {
    transform: translate3d(150%,-150%,0);
  }
}

.github-corner {
  z-index: 1;
  color: currentColor;
  position: absolute;
  top: 0; right: 0;
  transform: translate3d(0,0,0);
  transition: 333ms transform cubic-bezier(.7,.3,.25,1.15) 1200ms;
  will-change: transform;
  svg {
    width: 4rem; height: 4rem;
  }
  path {
    transition: 200ms fill linear;
    will-chrange: fill;
  }
  .octo-arm,
  .octo-body {
    fill: var(--color-contrast);
  }
  .triange {
    fill: var(--color-bg);
  }
}

.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}
!

JS 

              
                let timer;

function getColors(data) {
  let map = {};
  data.forEach(function(entry){
    map[entry.name] = entry.hex;
  });
  let nc = nearestColor.from(map);
  let buntName = new Vue({
    el: '.js-app',
    data: {
      rotation: 180,
      currentColor: {
        value: '#ffffff', 
        name: 'white',
        nameValue: '#ffffff',
        contrastValue: '#000000',
      }
    },
    methods: {
      update: function(e, val){
        const v = val || e.target.value;
        
        if( !tinycolor(v).isValid() ){
          return;
        }
        
        let c = nc(v); 
        this.currentColor.name = c['name'];
        this.currentColor.nameValue = c['value'];
       
        this.currentColor.value = v;
        
        clearTimeout(timer);
        timer = setTimeout(() => { window.location.hash = v }, 500);
        
        let complement = tinycolor(v).complement();
        this.currentColor.contrastValue = tinycolor.mostReadable(v, [
          complement.toHexString(),
          complement.saturate(20).toHexString(),
          complement.saturate(30).toHexString(),
          complement.brighten(20).toHexString(),
          complement.brighten(30).toHexString(),
          complement.darken(20).toHexString(),
          complement.darken(30).toHexString(),
          complement.lighten(20).toHexString(),
          complement.lighten(30).toHexString(),
          complement.desaturate(20).toHexString(),
          complement.desaturate(30).toHexString(),
        ],{
          includeFallbackColors:true,
          level:"A",
          size:"small"
        }).toHexString()

      }
    },
    ready: function(){
      
      if ( !Modernizr.inputtypes.color ) {
        const $c = document.querySelector("input[type='color']");
        $c.classList.add("{hash:true}");
        $c.setAttribute("onchange", "up(this.jscolor)");
        $c.setAttribute("type", "button");
        var picker = new jscolor($c);
        window.up = (e) => { 
          let val = tinycolor($c.style['background-color']).toHexString();
          this.update(e, val)
        }
      }
      
      const hash = window.location && window.location.hash;
      
      if (hash) {
        this.update(null, hash);
      } else {
        this.update(null, '#'+Math.floor(Math.random()*16777215).toString(16));
      }
      
      setTimeout(() => {
        this.$el.classList.remove('is-hidden');
      },10);
      
      setTimeout(() => {
        document.querySelector('input[type="text"]').focus();
      },2000);
    },
  }); 
}

const xhr = new XMLHttpRequest();
xhr.open('GET', '//color-names.herokuapp.com/v1/');
xhr.onload = e => {
    if (xhr.status === 200) {
      let resp = JSON.parse(xhr.responseText);
      getColors(resp.colors);
    } else {
        console.log(xhr.status);
    }
};
xhr.send();
!
999px

Console