JSFiddle - React, Tailwind, and code Playground

HTML

Enter Scroll Speed:
<input type="text" id="scrollVal" value="50" />
<div id="test"></div>

CSS

#test {
    height: 1000px;
}

JavaScript

$(function () {
    $(document).keyup(function (e) {
        if (e.which == 39) {
            window.scrollTo(0, parseInt($('#scrollVal').val(), 10) + $(document).scrollTop());
        } else if (e.which == 37) {
            window.scrollTo(0, $(document).scrollTop() - parseInt($('#scrollVal').val(), 10));
        }
    });
});