<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <!-- index.html -->
    <div id="container">
        <span id="text1"></span>
        <span id="text2"></span>
    </div>
    
    <svg id="filters">
        <defs>
            <filter id="threshold">
                <fe