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                <div class="custom-slider">
  <div class="custom-slider-track">
    <div class="custom-slider-button">


                html { background: #eee; }

.custom-slider { width: 100%; height: 7em; padding: 1em; box-sizing: border-box; }
.custom-slider-track { width: 100%; height: 100%; background: #2d89ef; box-sizing: border-box; position:relative; }
.custom-slider-button { width: 5em; height: 5em; background: #2b5797; box-sizing: border-box; position:absolute; top:0; left:0; } { background:  #ff0097; }

.custom-slider-button {	user-select: none; -moz-user-select: none; -khtml-user-select: none; -webkit-user-select: none; }


                /* to make the mouse slider work for touch, we need to add a boatload of
   new logic - add all event listeners, add conditional handling inside
   our existing functions. one thing we don't need for touch is binding
   to document, since touch events have implicit capture */

var t = document.querySelector(".custom-slider-button");

t.addEventListener('mousedown', sliderdown, true);
/* double-up event listeners */
t.addEventListener('touchstart', sliderdown, true);
/* and because touch events have implicit capture, bind events directly to element */
t.addEventListener('touchmove', slidermove, true);
t.addEventListener('touchend', sliderup, true);
t.addEventListener('touchcancel', sliderup, true);

function sliderdown(e) {
	// bind late
	if (e.type == 'mousedown') {
		document.addEventListener('mouseup', sliderup, true);
		document.addEventListener('mousemove', slidermove, true);
	} else {
    /* prevent scrolling, zooming, etc */

function sliderup(e) {
	// unbind
	if (e.type == 'mouseup') {
		document.removeEventListener('mousemove', slidermove, true);
		document.removeEventListener('mouseup', sliderup, true);

function slidermove(e) {
	var newpos;
  /* handle the different way in which mouse and touch events give us coordinates */
	if (e.type == 'mousemove') {
		newpos = e.clientX - t.parentElement.offsetLeft - (t.offsetWidth/2);
	} else {
		newpos = e.targetTouches[0].clientX - t.parentElement.offsetLeft - (t.offsetWidth/2);
	if (newpos < 0) {
		newpos = 0;
	} else if ( newpos > (t.parentElement.offsetWidth - t.offsetWidth)) {
		newpos = t.parentElement.offsetWidth - t.offsetWidth;
	} = newpos +'px';