grassyfield.js

https://github.com/awrichar/grassyfield.js

by awrichar

HTML

<script src="https://cdn.jsdelivr.net/gh/awrichar/grassyfield.js@2c81babf6a7536e5a3f64475861393185e57991d/grassyfield.js"></script>
<html>
<head>
</head>

<body>
<canvas id="canvas"></canvas>
</body>
</html>

CSS

.canvas-container {
  position: fixed !important;
  left: 0;
  bottom: 0;
  z-index: 0;
}

JavaScript

var field = new grassyField('canvas', 0.5);
field.resizeCanvas(window.innerWidth, 200);

window.onresize = function() {
  field.resizeCanvas(window.innerWidth, 200);
}