move the changed indicator on top of the editor textarea

so that you can actually see it.

glsl/files.js

  }
  var nameEl = document.createElement("input");
  nameEl.id = "editor-name";
  nameEl.value = files.current;
  nameEl.maxlength = 20;
  nameEl.placeholder = "Name of the shader";
  });
  var changeEl = document.createElement("span");
  changeEl.id = "editor-changed";
  
  editorEl.addEventListener("keydown", function(ev) {
    if (ev.ctrlKey && ev.keyCode == 83) { // Ctrl-s

glsl/raymarching.js

  border: none;
  background-color: rgba(255, 255, 255, 0.8);
}
#editor-changed {
  position: absolute;
  right: 0;
  top: 1.5em;
}
  `
  document.head.appendChild(styleEl);