JSFiddle - React, Tailwind, and code Playground

HTML

rgb calculations
<ul id='list-rgb'>
    
</ul>
<hr>
hsl calculations
<ul id='list-hsl'>
    
</ul>

CSS

li {
    display: block;
    float: left;
    width: 50px;
    height: 50px;
    margin: 2px;
}
hr {
    clear: both;
}

JavaScript

/**
 * http://stackoverflow.com/questions/2353211/hsl-to-rgb-color-conversion
 *
 * Converts an HSL color value to RGB. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes h, s, and l are contained in the set [0, 1] and
 * returns r, g, and b in the set [0, 255].
 *
 * @param   Number  h       The hue
 * @param   Number  s       The saturation
 * @param   Number  l       The lightness
 * @return  Array           The RGB representation
 */
function hslToRgb(h, s, l){
    var r, g, b;

    if(s == 0){
        r = g = b = l; // achromatic
    }else{
        function hue2rgb(p, q, t){
            if(t < 0) t += 1;
            if(t > 1) t -= 1;
            if(t < 1/6) return p + (q - p) * 6 * t;
            if(t < 1/2) return q;
            if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
            return p;
        }

        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
        var p = 2 * l - q;
        r = hue2rgb(p, q, h + 1/3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1/3);
    }

    return [Math.floor(r * 255), Math.floor(g * 255), Math.floor(b * 255)];
}

// convert a number to a color using hsl
function numberToColorHsl(i) {
    // as the function expects a value between 0 and 1, and red = 0° and green = 120°
    // we convert the input to the appropriate hue value
    var hue = i * 1.2 / 360;
    // we convert hsl to rgb (saturation 100%, lightness 50%)
    var rgb = hslToRgb(hue, 1, .5);
    // we format to css value and return
    return 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')'; 
}

// convert a color to a number using hsl
// based on formula as provided by @KamilT
function numberToColorRgb(i) {
    // we calculate red and green
    var red = Math.floor(255 - (255 * i / 100));
    var green = Math.floor(255 * i / 100);
    // we format to css value and return
    return 'rgb('+red+','+green+',0)'
}


// build the color sample lists
var $rgb = $('#list-rgb');
var $hsl =...