Liquid Fill Effect Button - Free UI Component

Initial Background #f1f5f9

Liquid Color #3b82f6

Initial Text Color #1e293b

Button Label Fill Liquid

Rounding (px) 12

Vertical Padding (rem) 1.25

Horizontal Padding (rem) 3.5

Font Size (rem) 1.1

Liquid Fill Effect Button

A stunning visual effect where the button appears to fill with liquid waves on hover. Features high-performance CSS animations and smooth color transitions.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Liquid Fill Button</title>
    <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=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap" rel="stylesheet">
    <style>
        /* -- Variables ------------------------------------------------- */
        :root {
            --btn-bg: {{btnBg}};           /* Initial Background */
            --liquid: {{liquidColor}};     /* Wave Color */
            --text-initial: {{textColor}}; /* Text Color (Before) */
            --text-hover: #fff;            /* Text Color (After) */
            --radius: {{borderRadius}}px;  /* Corner Rounding */
            --v-pad: {{vPadding}}rem;      /* Top/Bottom Padding */
            --h-pad: {{hPadding}}rem;      /* Left/Right Padding */
            --font-size: {{fontSize}}rem;  /* Text Size */
            --page-bg: #fff;               /* Preview Background */
        }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
            font-family: 'Plus Jakarta Sans', sans-serif;
            background-color: var(--page-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
        }

/* -- Button Implementation --------------------------------------- */
        .btn-liquid {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: var(--v-pad) var(--h-pad);
            background-color: var(--btn-bg);
            color: var(--text-initial);
            font-size: var(--font-size);
            font-weight: 700;
            border: none;
            border-radius: var(--radius);
            cursor: pointer;
            text-decoration: none;
            transition: color 0.5s ease;
            overflow: hidden;
            outline: none;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }

.btn-liquid span {
            position: relative;
            z-index: 1;
        }

.btn-liquid .liquid {
            position: absolute;
            top: -80px;
            left: 0;
            width: 200%;
            height: 200%;
            background-color: var(--liquid);
            box-shadow: inset 0 0 50px rgba(0,0,0,0.1);
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: 40%;
            transform: translateY(100%) rotate(0deg);
        }

/* Wave Animation */
        @keyframes liquid-fill {
            0% { transform: translateY(100%) rotate(0deg); }
            100% { transform: translateY(-20%) rotate(360deg); }
        }

.btn-liquid:hover {
            color: var(--text-hover);
        }

.btn-liquid:hover .liquid {
            animation: liquid-fill 2s linear infinite;
            transform: translateY(-20%) rotate(360deg);
        }

.btn-liquid:active {
            transform: scale(0.98);
        }

</style>
</head>
<body>

<button class="btn-liquid">
        <span>{{buttonText}}</span>
        <div class="liquid"></div>
    </button>

</body>
</html>