checkbox not working with multiple checkbox onclick

function myFunction(){
  var checkBox = document.getElementById("myCheck");
  var text = document.getElementById("text");
  if (checkBox.checked == true){
    text.style.display = "block";
  } else {
    text.style.display = "none";
}}

Checkbox 1: <input type="checkbox" id="myCheck" onclick="myFunction()"><p id="text" style="display:none">Checkbox 1 is CHECKED!</p><br>
Checkbox 2: <input type="checkbox" id="myCheck" onclick="myFunction()"><p id="text" style="display:none">Checkbox 2 is CHECKED!</p>