<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<title>Blobs Fill Effect</title>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<link rel='stylesheet' type='text/css' media='screen' href='style.css'>
</head>
<body>
<div class="buttons-wrapper">
<button class="blob-btn">
Blob Button
<span class="blob-btn__inner">
<span class="blob-btn__blobs">
<span class="blob-btn__blob"></span>
<span class="blob-btn__blob"></span>
<span class="blob-btn__blob"></span>
<span class="blob-btn__blob"></span>
</span>
</span>
</button>
<br />
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<filter id="splash">
<feGaussianBlur in="SourceGraphic" result="blur" stdDeviation="10"></feGaussianBlur>
<feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 21 -7"
result="splash"></feColorMatrix>
<feBlend in2="splash" in="SourceGraphic" result="mix"></feBlend>
</filter>
</defs>
</svg>
</div>
</body>
</html>