<div class="container" id="c-red" style="background-blend-mode: normal">
    <div class="menu">
      <span>Blend mode</span>
     
      <div class="menu__item">
     <ul id="blend">
      <li class="is--active">normal</li>
      <li>multiply</li>
      <li>overlay</li>
      <li>screen</li>
      <li>darken</li>
      <li>lighten</li>
      <li>color-dodge</li>
      <li>color-burn</li>
      <li>hard-light</li>
      <li>soft-light</li>
      <li>difference</li>
      <li>exclusion</li>
      <li>hue</li>
      <li>saturation</li>
      <li>color</li>
      <li>luminosity</li>
    </ul>
      </div>
  </div>
  

  <ul id="color">
    <li class='is--active'>red</li>
    <li>yellow</li>
    <li>green</li>
  </ul>
  
</div>

* {
  box-sizing: border-box;
}

body, html {
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  font-family: 'Source Sans Pro', sans-serif;
}

.container {
  display: block;
  background-size: 100%;
  height: 100%;
  width: 100%px;
  padding: 20px;
  background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/14179/image.jpg') no-repeat 0 0;
  border-top: 29px solid transparent;
  background-size: 100%;
  background-size: cover;
}

.menu {
  border: 3px solid #333;
  background-color: white;
  background-color: rgba(255,255,255,.8);
  display: inline-block;
  padding: 15px 15px 6px 15px;
  width: 200px;
  position: relative;
  height: 221px;

 
  span, ul {
    float: left;
  }
  
  span {
    clear: left;
    margin-right: 0;
    margin-bottom: 0;
    text-transform: uppercase;
    font-size: 16px;
    width: 100%;
    display: block;
    border-bottom: 2px solid black;
    margin-bottom: 10px;
  }
}

.menu__item {
  overflow: scroll;
  height: 165px;
  display: block;
  clear: both;
}

#color {
  position: absolute;
  top: 0;
  left: 20px;
  
  li {
    float: left;  
    margin-right: 0;
    text-transform: uppercase;
    padding: 6px 15px;
    border: none;
    
    &:hover,
    &:focus {
      padding: 6px 15px;
      border: none;
    }
    
    &.is--active {
      border: none;
      padding: 6px 15px;
      background-color: black;
      color: white;
    }
  }
}

select {
font-size: 18px;
}

ul {
  margin: 0;
  margin-bottom: 15px;
  padding: 0;
  list-style: none;
  
  li {
    pointer: cursor;
    font-size: 13px;
    padding: 5px 6px;
    border: 1px solid transparent;
    display: block;
    
    &:hover,
    &:focus {
      cursor: pointer;
      background-color: white;
    }
  }
}

.is--active {
  border: 1px dashed #aaa;
  background-color: white;
}

#c-red {
  background-color: #FF4136;
}

#c-yellow {
  background-color: #FFDC00;
}

#c-green {
  background-color: #09CD56;
}

var container = document.querySelector('.container'),
    blendMode = document.getElementById('blend'),
    color = document.getElementById('color');

blendMode.addEventListener('click', function(e) {
  if (e.target != e.currentTarget){
    var value = e.target.textContent;
    container.style.backgroundBlendMode = value;
    removeCurrentClasses(blendMode);
    e.target.classList.add('is--active');
  }
});


var removeCurrentClasses = function(parent){
    for (var i = 0; i < parent.children.length; i++){  
      parent.children[i].className = "";
    }
}

color.addEventListener('click', function(e){
  
  if(e.target != e.currentTarget) {
    var colorValue = e.target.textContent;
     removeCurrentClasses(color);
    e.target.className = "is--active";
    container.id = "c-" + colorValue;
  }
})