CodePen

HTML

            
              <input type="checkbox" id="check-1"/>
<label for="check-1">Byrnes, Amanda</label>

            
          
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CSS

            
              input[type="checkbox"]:checked+label{
  text-decoration: line-through; 
  color: rgba(0,0,0,.3); 
}
            
          
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JavaScript

            
              
            
          
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999px
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