CSS Glassmorphism Button with Shine Animation

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Water Drop Button</title>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,600;1,14..32,600&display=swap');

:root {
            --shine-url: url('https://i.imgur.com/NrNshvB.png');
        }

body {
            margin: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background-color: #f0f0f0;
        }

.container {
            background: var(--bg-url) center no-repeat;
            background-size: cover;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 600px;
            width: 800px;
            border-radius: 20px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.2);
        }

button {
            font-family: "Inter", sans-serif;
            font-weight: 600;
            color: #727272;
            font-size: 16px;
            display: flex;
            height: 54px;
            justify-content: center;
            align-items: center;
            border: none;
            padding: 0 2.5em; /* Increased padding for better proportions */
            position: relative;
            border-radius: 72px;
            cursor: pointer;
            
            /* Glassmorphism & Gradient */
            background: radial-gradient(98.54% 109.61% at 73.57% -7.45%, #CCC 0%, rgba(237, 237, 237,.6) 75%);
            backdrop-filter: blur(2px);
            
            /* Complex Inset Shadows for Depth */
            box-shadow: 
                4px -4px 9.6px 0px rgba(86, 86, 86, 0.08) inset, 
                2px -2px 9px 0px rgba(0, 0, 0, 0.16) inset, 
                1px -1px 9.4px 0px rgba(0, 0, 0, 0.20) inset, 
                -4px 5px 6.7px 1px rgba(0, 0, 0, 0.55), 
                -3px 4px 9.2px 0px rgba(0, 0, 0, 0.60) inset;

/* Animation Settings */
            transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            transform-origin: center;
            user-select: none;
        }

/* The Shine/Reflection Element */
        button:after {
            content: "";
            display: block;
            width: 50px;
            height: 20px;
            background: var(--shine-url) center / contain no-repeat;
            position: absolute;
            top: 4px;
            right: 15px;
            opacity: 0.7;
            transition: all 0.5s ease;
            pointer-events: none;
            /* Constant subtle pulse */
            animation: shine-float 3s ease-in-out infinite;
        }

/* --- Hover State --- */
        button:hover {
            transform: scale(1.08) translateY(-3px);
            color: #555;
            box-shadow: 
                4px -4px 9.6px 0px rgba(86, 86, 86, 0.08) inset, 
                2px -2px 9px 0px rgba(0, 0, 0, 0.16) inset, 
                1px -1px 9.4px 0px rgba(0, 0, 0, 0.20) inset, 
                -8px 12px 18px 2px rgba(0, 0, 0, 0.4), /* Larger outer shadow */
                -3px 4px 9.2px 0px rgba(0, 0, 0, 0.60) inset;
        }

button:hover:after {
            opacity: 1;
            transform: translateX(-3px) scale(1.1);
        }

/* --- Active (Click) State --- */
        button:active {
            transform: scale(0.95) translateY(1px);
            transition: all 0.1s ease;
            box-shadow: 
                2px -2px 4px 0px rgba(86, 86, 86, 0.08) inset, 
                -2px 3px 5px 1px rgba(0, 0, 0, 0.5); /* Tuck shadow in */
        }

/* --- Keyframes --- */
        @keyframes shine-float {
            0%, 100% { transform: translateY(0) scale(1); opacity: 0.7; }
            50% { transform: translateY(1px) scale(1.05); opacity: 0.9; }
        }
    </style>
</head>
<body>

<div class="container">
    <button>Button</button>
</div>

</body>
</html>

CSS Glassmorphism Button with Shine Animation

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