<!-- currently works properly in Chrome only, JS fallback required for IE/FF -->
<h1>CSS Range Slider</h1>
<h3>JS used for color-change and % label</h3>
<input type="range" value="0">
<div id="h4-container"><div id="h4-subcontainer"><h4>0<span></span></h4></div></div>

html {
	height: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	font-family: 'Work Sans', sans-serif;
	text-align: center;
	h1, h2, h3, h4, h5, h6 {
		margin: 0;
	}
	h1 {
		color: #333;
		font-weight: 500;
	}
	h3 {
		color: #aaa;
		font-weight: 500;
	}
	h4 {
		color: #999;
		font-weight: 500;
		&:after {
			content: "%";
			padding-left: 1px;
		}
	}
	// now for the good stuff 🎉
	input[type="range"] {
		outline: 0;
		border: 0;
		border-radius: 500px;
		width: 400px;
		max-width: 100%;
		margin: 24px 0 16px;
		transition: box-shadow 0.2s ease-in-out;
		// Chrome
		@media screen and (-webkit-min-device-pixel-ratio:0) {
			& {
				overflow: hidden;
				height: 40px;
				-webkit-appearance: none;
				background-color: #ddd;
			}
			&::-webkit-slider-runnable-track {
				height: 40px;
				-webkit-appearance: none;
				color: #444;
				// margin-top: -1px;
				transition: box-shadow 0.2s ease-in-out;
			}
			&::-webkit-slider-thumb {
				width: 40px;
				-webkit-appearance: none;
				height: 40px;
				cursor: ew-resize;
				background: #fff;
				box-shadow: -340px 0 0 320px #1597ff, inset 0 0 0 40px #1597ff;
				border-radius: 50%;
				transition: box-shadow 0.2s ease-in-out;
				position: relative;
				// top: 1px;
			}
			&:active::-webkit-slider-thumb {
				background: #fff;
				box-shadow: -340px 0 0 320px #1597ff, inset 0 0 0 3px #1597ff;
			}
		}
		// Firefox
		&::-moz-range-progress {
			background-color: #43e5f7; 
		}
		&::-moz-range-track {  
			background-color: #9a905d;
		}
		// IE
		&::-ms-fill-lower {
			background-color: #43e5f7; 
		}
		&::-ms-fill-upper {  
			background-color: #9a905d;
		}
	}
}
#h4-container {
	width: 400px;
	max-width: 100%;
	padding: 0 20px;
	box-sizing: border-box;
	position: relative;
	#h4-subcontainer {
		width: 100%;
		position: relative;
		h4 {
			display: flex;
			align-items: center;
			justify-content: center;
			position: absolute;
			top: 0;
			width: 40px;
			height: 40px;
			color: #fff !important;
			font-size: 12px;
			transform-origin: center -10px;
			transform: translateX(-50%);
			transition: margin-top 0.15s ease-in-out,
				opacity 0.15s ease-in-out;
			span {
				position: absolute;
				width: 100%;
				height: 100%;
				top: 0;
				left: 0;
				background-color: #1597ff;
				border-radius: 0 50% 50% 50%;
				transform: rotate(45deg);
				z-index: -1;
			}
		}
	}
}
input:not(:active) + #h4-container h4 {
	opacity: 0;
	margin-top: -50px;
	pointer-events: none;
}

$(function() {
	var rangePercent = $('[type="range"]').val();
	$('[type="range"]').on('change input', function() {
		rangePercent = $('[type="range"]').val();
		$('h4').html(rangePercent+'<span></span>');
		$('[type="range"], h4>span').css('filter', 'hue-rotate(-' + rangePercent + 'deg)');
		// $('h4').css({'transform': 'translateX(calc(-50% - 20px)) scale(' + (1+(rangePercent/100)) + ')', 'left': rangePercent+'%'});
		$('h4').css({'transform': 'translateX(-50%) scale(' + (1+(rangePercent/100)) + ')', 'left': rangePercent+'%'});
	});
});