from green to red color depend on percentage

by

A simple scheme using HSL along with fiddle:

function getColor(value){
    //value from 0 to 1
    var hue=((1-value)*120).toString(10);
    return ["hsl(",hue,",100%,50%)"].join("");
}

tweak saturation and luminosity as needed. and a fiddle.

function getColor(value) {
  //value from 0 to 1
  var hue = ((1 - value) * 120).toString(10);
  return ["hsl(", hue, ",100%,50%)"].join("");
}
var len = 20;
for (var i = 0; i <= len; i++) {
  var value = i / len;
  var d = document.createElement('div');
  d.textContent = "value=" + value;
  d.style.backgroundColor = getColor(value);
  document.body.appendChild(d);
}

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