input:checked top div needs to run -CSS

I need to change the color of a <p> to red (color:red;) whenever the checkbox is checked:

input:checked~.txt {
  color: red;
}

<div>
  <p class="txt">CodePen!</p>
  <input type="checkbox" />
</div>

I expect the result as we checked that box that the color of the txt needs to be changed to red.