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HTML

              
                <div class="canvas-wrapper">
  <canvas id="canvas" width="500" height="300"></canvas>
</div>
<main id="main">
  <h1>Pretty Delaunay Triangles</h1>

  <form id="form">
    <h2 class="headline-toggle">Configuration</h2>
    <input type="checkbox" class="headline-toggle check-toggle" id="hide-config" checked/><label for="hide-config"></label>

    <fieldset id="generate-buttons">
      <legend><h3>Generate</h3></legend>
      <div class="form-row">
        <button id="generate" data-generate-colors data-generate-gradients data-generate-triangles>Redo all</button>
      </div>
      <div class="form-row">
        <button id="generate-colors" data-generate-colors>Redo Colors</button>
        <button id="generate-gradients" data-generate-gradients>Redo Gradients</button>
        <button id="generate-triangles" data-generate-triangles>Redo Triangles</button>
      </div>
    </fieldset>

    <fieldset id="render-options">
      <legend><h3>Render options</h3></legend>

      <div class="form-row">
        <input type="checkbox" name="show-animation" id="show-animation" /><label for="show-animation">Animation</label>
        <input type="checkbox" name="show-hover" id="show-hover" checked /><label for="show-hover">Hover Effect</label>
      </div>

      <div class="form-row">
        <input type="checkbox" name="show-triangles" id="show-triangles" checked /><label for="show-triangles">Triangles</label>
        <input type="checkbox" name="show-edges" id="show-edges" checked /><label for="show-edges">Edges</label>
        <input type="checkbox" name="show-points" id="show-points" /><label for="show-points">Points</label>
        <input type="checkbox" name="show-centroids" id="show-centroids" /><label for="show-centroids">Centroids</label>
      </div>

      <div class="form-row">
        <input type="checkbox" name="show-circles" id="show-circles" /><label for="show-circles">Gradient circles</label>
      </div>
    </fieldset>

    <fieldset id="point-options">
      <legend><h3>Point density options</h3></legend>

      <div>
        <input type="radio" name="point-gen" value="multiplier" id="point-gen-option-multiplier" checked />
        <label for="point-gen-option-multiplier" id="point-gen-multiplier-label">Multiplier (based on size of canvas)</label>
      </div>
      <div class="form-row">
        <input type="range" id="points-multiplier" value="0.5" min="0.01" max="1" step="0.01" aria-labelledby="point-gen-multiplier-label" aria-describedby="points-min points-max">
        <label for="points-multiplier">0.1</label>
        <label for="points-multiplier">1.0</label>
      </div>

      <div>
        <input type="radio" name="point-gen" value="exactly" id="point-gen-option-exact" />
        <label for="point-gen-option-exact">Exact range:</label>

        <fieldset>
          <legend><h4>Point density ranges</h4></legend>
          <div class="form-row">
            <label for="min-points">Points</label>
            <input id="min-points" type="number" min="1" max="10000" value=""/>
            <label for="max-points">to</label>
            <input id="max-points" type="number" min="1" max="10000" value=""/>
          </div>

          <div class="form-row">
            <label for="min-edge-points">Edge Points</label>
            <input id="min-edge-points" type="number" min="1" max="10000" value=""/>
            <label for="max-edge-points">to</label>
            <input id="max-edge-points" type="number" min="1" max="10000" value=""/>
          </div>
        </fieldset>
      </div>
    </fieldset>

    <fieldset id="background-options">
      <legend><h3>Background options</h3></legend>

      <div class="form-row">
        <label for="min-gradients">Gradients</label>
        <input id="min-gradients" type="number" min="1" max="100" value="1"/>
        <label for="max-gradients">to</label>
        <input id="max-gradients" type="number" min="1" max="100" value="10"/>
      </div>

      <div class="form-row">
        <input type="radio" name="background" value="random" id="color-random-option" checked />
        <label for="color-random-option">Random colors</label>
        <input type="radio" name="background" id="color-choose-option" />
        <label for="color-choose-option">Choose colors:</label>
      </div>
      <fieldset id="color-inputs">
        <legend>Custom colors:</legend>
        <div class="form-row">
          <label for="color-1">Inner color:</label>
          <input type="color" id="color-1" data-color-sync="color-1-hex" value="#FFFFFF">
          <input type="text" id="color-1-hex" data-color-sync="color-1" value="#FFFFFF">
        </div>

        <div class="form-row">
          <label for="color-2">Middle color:</label>
          <input type="color" id="color-2" data-color-sync="color-2-hex" value="#888888">
          <input type="text" id="color-2-hex" data-color-sync="color-2" value="#888888">
        </div>

        <div class="form-row">
          <label for="color-3">Outer color:</label>
          <input type="color" id="color-3" data-color-sync="color-3-hex" value="#000000">
          <input type="text" id="color-3-hex" data-color-sync="color-3" value="#000000">
        </div>
      </fieldset>
      <div>
        <input type="radio" name="background" id="color-image-option" />
        <label for="color-image-option">Image</label>
        <fieldset>
          <div class="form-row">
            <input type="radio" name="image-background" id="image-background-upload-option" checked />
            <label for="image-background-upload-option">Upload:</label>
            <input type="file" id="image-background-upload" accept="image/*">
          </div>
          <div class="form-row">
            <input type="radio" name="image-background" id="image-background-url-option" />
            <label for="image-background-url-option" id="image-background-url-label">URL:</label>
            <input type="url" id="image-background-url" aria-labelledby="image-background-url-label" value="">
          </div>
        </fieldset>
      </div>
    </fieldset>
  </form>
</main>
              
            
!

CSS

              
                $row-vertical-spacing: 0.75rem;
$label-horizontal-spacing: 0.5rem;

html {
  height: 100%;
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  position: relative;
  min-height: 100%;

  font-family: sans-serif;
}

main {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  overflow-x: hidden;
  overflow-y: auto;

  margin: 0;
  padding: 1rem;
  text-align: center;

  & > * {
    z-index: 1;
    position: relative;
  }
}

* {
  box-sizing: border-box;

  & + * {
    margin-top: $row-vertical-spacing;
  }
}

hr {
  margin: 1rem 0;
  -webkit-margin-collapse: separate;
}

h1, h2, h3, h4, h5 {
  margin-top: 0;
  margin-bottom: 0.5em;
}
form {
  display: inline-block;
  text-align: left;
}

.canvas-wrapper {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: hidden;
}

canvas, canvas + canvas {
  margin: 0;
}

.form-row {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;

  > * {
    flex-grow: 1;
    flex-basis: 0;

    margin-top: 0;
    margin-left: $label-horizontal-spacing;

    &:first-child {
      margin-left: 0;
    }
  }

  > input {
    &[type=radio],
    &[type=checkbox] {
      flex-grow: 0;
      flex-basis: auto;
      margin-left: 0;

      ~ input {
        margin-left: 1rem;
      }
    }

    &[type=range] {
      flex-grow: 100;

      ~ label {
        margin-left: $label-horizontal-spacing;
        flex-grow: 1;
        flex-basis: auto;
      }

      + label {
        order: -1;
        margin-left: 0;
        margin-right: $label-horizontal-spacing;
      }
    }

    &[type=number] + label {
      flex-grow: 0;
    }

    &[type=url] {
      flex-grow: 10;
    }

    &[type=color] {
      flex-grow: 1.5;

      + input {
        width: 5em;
        flex-grow: 0;
      }
    }

  }

  legend + & {
    margin-top: 0.5rem;
  }
}

fieldset {
  > *:first-child {
    margin-top: $row-vertical-spacing;
  }
}

input {
  & ~ fieldset {
    opacity: 0.3;
    pointer-events: none;
    margin: 0.5rem 0 1rem;

    .form-row & {
      margin: 0.5rem 0 1rem;
      pointer-events: all;
    }

    *:last-child > &:last-child {
      margin-bottom: 0;
    }
  }

  &:checked ~ fieldset {
    opacity: 1;
    pointer-events: all;
  }

  &[type=radio],
  &[type=checkbox] {
    margin: 0;

    label + & {
      margin-left: 1em;
    }
  }

  &[type=color] {
    height: 2rem;
    padding: 2px;
    border-width: 1px;
  }

  + label {
    margin-left: $label-horizontal-spacing;
  }
}

button {
  padding: 4px 2px 5px 2px;
  font-size: 0.75rem;
}

.a11y {
  position: absolute;
	clip: rect(1px 1px 1px 1px);
	clip: rect(1px, 1px, 1px, 1px);
	clip-path: inset(0px 0px 99.9% 99.9%);
	overflow: hidden;
	height: 1px;
	width: 1px;
	padding: 0;
	border: 0;
}

.theme-light {
  color: white;
}

.theme-dark {
  color: black;
}

.theme-light,
.theme-dark {
  input, button {
    color: black;
  }
}

.check-toggle {
  -webkit-appearance: none;
  height: 0;
  width: 0;
  visibility: hidden;
  overflow: hidden;

  + label:after {
    content: 'Show';
  }

  ~ fieldset {
    visibility: hidden;
    height: 1px;
  }

  &:checked {
    + label:after {
      content: 'Hide';
    }

    ~ fieldset {
      visibility: visible;
      height: auto;
    }
  }
}

.headline-toggle {
  display: inline-block;
}

              
            
!

JS

              
                // see https://github.com/cshaver/pretty-delaunay/blob/master/src/demo.js
              
            
!
999px

Console