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              <div class="wrapper">
    <canvas id="canvas" width="500" height="500"></canvas>

    <div class="controls">
        <input type="range" class="controls__range js-maxSections" step="10" min="10" max="300" value="150" />
        <input type="range" class="controls__range js-maxWidth" step="10" min="50" max="800" value="300" />

        <button type="button" name="button" class="controls__button js-random">
        Random</button>

        <a href="" class="controls__button js-download" download="Striped Cones">Download</a>
    </div>
</div>
            
          
!
            
              HTML, BODY {
    height: 100%;
}

HTML {
    font-size: 14px;
}

BODY {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #000;
    background-image: linear-gradient(to right, hsla(0, 0%, 100%, .045) 50%, transparent 50%);
    background-size: 2rem 100%;
    font-family: Trebuchet MS;
}

.wrapper {
    position: relative;
}

canvas {
    margin: 0;
    max-width: 100%;
    height: auto;
}

.controls {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: .25rem;
    box-sizing: border-box;
    background: rgba(0, 0, 0, .75);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.controls__range {
    flex-grow: 1;
    margin: 1rem;
}

.controls__button {
    flex-grow: 1;
    min-height: 2rem;
    margin: .5rem;
    padding: 0;
    max-width: 150px;
    background: transparent;
    border: 1px solid #FFF;
    border-radius: 5px;
    text-align: center;
    text-decoration: none;
    font-size: 1rem;
    line-height: 2rem;
    color: #FFF;
    transition: all .25s;
}

.controls__button:active {
    background: #FFF;
    color: orangered;
}
            
          
!
            
              var doc = document;
var canvas = doc.querySelector('#canvas');
var ctx = canvas.getContext('2d');

var width = window.innerWidth;
var height = window.innerHeight;
canvas.width = width;
canvas.height = height;

var maxSectionsInput = doc.querySelector('.js-maxSections');
var maxWidthInput = doc.querySelector('.js-maxWidth');
var controls = doc.querySelector('.controls');
var randomBtn = doc.querySelector('.js-random');
var downloadBtn = doc.querySelector('.js-download');

var maxSections = 150;
var maxLineWidth = 250;

var lineStep = 0;
var sectionLength = 0;
var rowLength = 0;
var xOffset = 0;

calsVars();

//---------------------------------------------

var colors = [
  'crimson',
  'tomato',
  'salmon',
  'orangered',
  'palegoldenrod',
  'khaki',
  'gold',
  'yellowgreen',
  'olive',
  'aquamarine',
  'mediumturquoise',
  'darkturquoise',
  'darkcyan',
  'skyblue',
  'cornflowerblue',
  'rebeccapurple',
  'purple',
  'darkviole'
];

function getColorPos(prevColorPos) {
  var colorPos = Math.floor(Math.random() * colors.length);

  while (colorPos === prevColorPos) {
    colorPos = Math.floor(Math.random() * colors.length);
  }

  prevColorPos = colorPos;
  return colorPos;
}

//---------------------------------------------

function drawSection(params) {
  var x = params.x;
  var y = params.y;
  var lineWidth = params.lineWidth;
  var color = params.color;

  ctx.strokeStyle = color;
  ctx.lineWidth = lineWidth;
  ctx.lineCap = 'round';

  ctx.beginPath();
  ctx.moveTo(x, y);
  ctx.lineTo(x, y + sectionLength);
  ctx.stroke();
}

//---------------------------------------------

function drawBlock(x) {
  var lastColorPos = 0;
  var colorPos1 = null;
  var colorPos2 = null;

  for (var i = 0; i < maxSections; i++) {
    var lineWidth = maxLineWidth - lineStep * i;

    var currentColorPos1 = getColorPos(colorPos1);
    colorPos1 = currentColorPos1;
    var currentColorPos2 = getColorPos(colorPos2);
    colorPos2 = currentColorPos2;

    drawSection({
      x: x + maxLineWidth/2,
      y: i * sectionLength,
      lineWidth: lineWidth,
      color: colors[currentColorPos2]
    });

    drawSection({
      x: x - maxLineWidth,
      y: height - i * sectionLength,
      lineWidth: lineWidth,
      color: colors[currentColorPos1]
    });

  }
}

//---------------------------------------------

function drawCones() {
  for (var i = 0; i <= rowLength + 2; i++) {
    drawBlock((i - 1) * maxLineWidth + xOffset);
  }
}

//---------------------------------------------

function calsVars() {
  lineStep = maxLineWidth / maxSections;
  sectionLength = height / maxSections;
  rowLength = Math.round(width / maxLineWidth);
  xOffset = (width - rowLength * maxLineWidth) / 2;
}

function maxSectionsChange() {
  maxSections = +this.value;
  calsVars();
  drawCones();
}

function maxWidthChange() {
  maxLineWidth = +this.value;
  calsVars();
  drawCones();
}

//---------------------------------------------

function rand(min, max) {
  return Math.round(Math.random() *(max - min) + min);
}

function randomizeVals() {
  maxSections = rand(maxSectionsInput.min, maxSectionsInput.max);
  maxSectionsInput.value = maxSections;

  maxLineWidth = rand(maxWidthInput.min, maxWidthInput.max);
  maxWidthInput.value = maxLineWidth;

  calsVars();
  drawCones();
}

//---------------------------------------------

function download() {
  var dataUrl = canvas.toDataURL();
  downloadBtn.href = dataUrl;
}

//---------------------------------------------

drawCones();

maxSectionsInput.addEventListener('input', maxSectionsChange);
maxWidthInput.addEventListener('input', maxWidthChange);

randomBtn.addEventListener('click', randomizeVals);
downloadBtn.addEventListener('click', download);

            
          
!
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