HTML/CSS - password validation in javascript Online Editor and JavaScript Compiler

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Show Password</title>
    <script src="https://kit.fontawesome.com/fb2b493b4c.js" crossorigin="anonymous"></script>
    <link rel="icon" href="titles/favicon.ico" type="image/x-icon">
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
    <link rel="manifest" href="/site.webmanifest">
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Exo+2:wght@100&display=swap" rel="stylesheet">
    <style>
        * {
            box-sizing: border-box;
            padding: 0;
            margin: 0;
            font-family: 'Exo+2' , cursive;
        }
        body {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 10px;
css
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