javascript - chroma.js is undefined, trying to create a website -


i trying create simple webpage fun , have found interesting background theme on codepen called "the floor lava" , trying work ( using atom). have applied code website , added html code:

<html>   <head>     <link rel="stylesheet" type="text/css" href="style.css" />     <meta charset="utf-8">     <title></title>   </head>   <body>     <canvas id="canvas"></canvas>       <script src="app.js"></script>     <h1>name</h1>   </body> </html>

however getting error when inspect element saying this:

uncaught referenceerror: chroma not defined     @ init (app.js:89)     @ app.js:106     @ app.js:108 app.js:163 uncaught referenceerror: dat not defined     @ datgui (app.js:163)     @ app.js:186

i have idea of is, sort of colour library.

note new @ , trying learn. hope sufficient information. here website should wish @ full code (https://codepen.io/supah/pen/mmmdxg).

many in advance


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