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A Pen By Jomo

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CSS Base

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HTML

            
              <ul>
  <li class="select"></li>
  <li class="select"></li>
  <li id="origin">Click</li>
  <li class="select"></li>
  <li class="select"></li>
</ul>
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CSS

            
              @import url(https://fonts.googleapis.com/css?family=Quicksand);
*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  color:#fff;
  font-family: 'Quicksand', sans-serif;
}
ul{
  text-align:center;
  padding:64px;
}
li{
  display:inline-block;
  vertical-align:middle;
  margin:4px;
  width:64px;
  height:64px;
  line-height:64px;
}
.select{
  background:rgba(200,200,200,1);
  }
.active{
  background:rgba(99,214,218,0.5);
}
#origin{
  background:rgba(99,214,218,1.0);
  text-align:center;
  cursor:pointer;
}
!

JS

            
              $('#origin').on('click',function(){
   $(this).siblings('.select').addClass('active');
});
!
999px
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Console