the padding on the horizontal slider's element is affecting the draw size of its canvas. Not a huge issue because all it means is that the horizontal slider's stick is clipped when in the -100 position. I left some console.log() in both controller.js adjustSliderSizes() and slider.js resize() to provide some kind of traceback. Upon initial load of page the slider's canvas size is correct, but after the first adjustment via adjustSliderSizes(), the canvas's height is larger than it should be (by a value equal to the padding created by the canvas element's parent column. Using Bulma's is-paddingless just makes it worse.