How do I write a function that changes thumb size based on slider value?

I’m pretty new to JavaScript so I’ve been messing around and teaching myself how to use the functions. I’m trying to use setInterval to make a function that constantly changes the size of the thumb based on the value of the slider.

I tried to use getElementById and other things and I can’t figure it out.

Here is the HTML:

<input type="range" class="javaRange" id="rangeInput2" name="rangeInput2" min="0" max="1000" value="0"
    oninput="amount2.value=rangeInput2.value">
    <output id="amount2" name="amount2" for="rangeInput2">0</output>

Here is the CSS (The slider is customized):

<style>
.javaRange {
  -webkit-appearance: none;
  background-color: #cdfffe;
  height: 20px;
  overflow: visible;
  width: 400px;
  border-radius: 50px;
}



.javaRange::-webkit-slider-thumb {
  -webkit-appearance: none;
  background: #00918f;
  border-radius: 50%;
  cursor: pointer;
  height: 20px;
  width: 20px;
  border: 0;
}
</style>

and here is the JavaScript that I have currently:

<script>
const constant = 0.12;
const thumbValue = document.getElementById("rangeInput2").value;
function thumbSize(){
  document.getElementById("rangeInput2").style.width = 20 + parseInt(thumbValue) + "px";
  document.getElementById("rangeInput2").style.height = 20 + parseInt(thumbValue) + "px";
};
setInterval(thumbSize());
</script>

I’ve tried so many things. please help!

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