make slider values width static

glsl/sliders.js

@@ -28,6 +28,7 @@ function makeSlider(name, range, onChange) {
  sliderContainerEl.appendChild(sliderEl);
  var sliderValueEl = document.createElement("span");
  sliderValueEl.style = "display: inline-block; width: 3em;";
  sliderValueEl.textContent = sliderEl.value;
  sliderContainerEl.appendChild(sliderValueEl);