Example of customizing HTML5 input type range.
HTML:
<!DOCTYPE html> <html> <head> <link type="text/css" rel="stylesheet" href="/myStyle.css"> </head> <body> <input type="range" id="test" min="10" max="100" step="1"> </body> </html>
CSS:
input[type='range'] {
    -webkit-appearance: none !important;
    background:red;
    height:7px;
}
input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    background:blue;
    width: 34px;
    height: 34px;
	border: 1px solid rgba(200,200,200,1);
    border-radius: 18px;
}
Look on an example here.