how to keep style after click

<input type="checkbox" id="activate-div">
  <label for="activate-div">
   <div class="my-div">
      //MY DIV CONTENT
   </div>
  </label>

#activate-div{display:none}    

.my-div{background-color:#FFF} 

#activate-div:checked ~ label 
.my-div{background-color:#000}