Aura Underline Reveal Button - Free UI Component

Text Color #94a3b8

Underline Color #818cf8

Line Height (px) 2

Button Label Learn More

Rounding (px) 4

Vertical Padding (rem) 1

Horizontal Padding (rem) 1

Font Size (rem) 1

Aura Underline Reveal Button

A refined minimalist link-style button featuring a kinetic directional underline reveal. Perfect for tertiary actions and navigational elements in clean, modern designs.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Underline Reveal 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 {
            --text: {{textColor}};               /* Typography Color */
            --u-color: {{underlineColor}};       /* Feature Underline */
            --u-height: {{underlineHeight}}px;   /* Feature Thickness */
            --radius: {{borderRadius}}px;        /* Substrate Rounding */
            --v-pad: {{vPadding}}rem;            /* Spacing Y */
            --h-pad: {{hPadding}}rem;            /* Spacing X */
            --font-size: {{fontSize}}rem;        /* Text Scale */
            --page-bg: #0f172a;
        }

*, *::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-underline {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: var(--v-pad) var(--h-pad);
            font-size: var(--font-size);
            font-weight: 600;
            color: var(--text);
            background: transparent;
            border: none;
            border-radius: var(--radius);
            cursor: pointer;
            text-decoration: none;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            letter-spacing: -0.01em;
            outline: none;
        }

/* Underline Reveal - Now spans the full width of the padded area */
        .btn-underline::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: var(--u-height);
            background-color: var(--u-color);
            transform: scaleX(0);
            transform-origin: right;
            transition: transform 0.4s cubic-bezier(0.65, 0, 0.35, 1);
            border-radius: 2px;
        }

/* Hover Dynamics - Added subtle background to make 'radius' visible */
        .btn-underline:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.05); /* Makes rounding visible */
        }

.btn-underline:hover::after {
            transform: scaleX(1);
            transform-origin: left;
        }

.btn-underline:active {
            transform: scale(0.96);
            background: rgba(255, 255, 255, 0.1);
        }

</style>
</head>
<body>

<button class="btn-underline">
        {{buttonText}}
    </button>

</body>
</html>