Animated Border Button

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Border Button</title>
    <style>
        /*
         Component: Animated Border Button
         Description: A button with a CSS border animation on hover.
        */

:root {
            --anim-border-color: #007bff;
            --anim-border-width: 2px;
            --anim-border-transition-speed: 0.3s;
            --btn-padding-y: 1rem;
            --btn-padding-x: 2rem;
        }

.anim-border-container-1 {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 250px;
            background-color: #f8f9fa;
        }

.anim-border-btn-1 {
            position: relative;
            display: inline-block;
            /* Use the variables here */
            padding: var(--btn-padding-y) var(--btn-padding-x);
            font-size: 1.25rem;
            font-weight: 600;
            color: #343a40;
            background-color: transparent;
            border: none;
            cursor: pointer;
            text-decoration: none;
        }

.anim-border-btn-1 span {
            position: relative;
            z-index: 2;
        }

.anim-border-btn-1::before,
        .anim-border-btn-1::after {
            content: '';
            position: absolute;
            background: var(--anim-border-color);
            transition: transform var(--anim-border-transition-speed) ease-out;
        }

/* Top horizontal line */
        .anim-border-btn-1::before {
            top: 0;
            left: 0;
            width: 100%;
            height: var(--anim-border-width);
            transform: scaleX(0);
            transform-origin: left;
        }

/* Left vertical line */
        .anim-border-btn-1::after {
            top: 0;
            left: 0;
            width: var(--anim-border-width);
            height: 100%;
            transform: scaleY(0);
            transform-origin: top;
        }

.anim-border-btn-1 span::before,
        .anim-border-btn-1 span::after {
            content: '';
            position: absolute;
            background: var(--anim-border-color);
            transition: transform var(--anim-border-transition-speed) ease-out;
        }

/* Bottom horizontal line */
        .anim-border-btn-1 span::before {
            bottom: calc(-1 * (var(--btn-padding-y) + var(--anim-border-width)));
            left: calc(-1 * var(--btn-padding-x));
            width: calc(100% + (var(--btn-padding-x) * 2));
            height: var(--anim-border-width);
            transform: scaleX(0);
            transform-origin: right;
        }

/* Right vertical line */
        .anim-border-btn-1 span::after {
            top: calc(-1 * var(--btn-padding-y));
            right: calc(-1 * var(--btn-padding-x));
            width: var(--anim-border-width);
            height: calc(100% + (var(--btn-padding-y) * 2));
            transform: scaleY(0);
            transform-origin: bottom;
        }

.anim-border-btn-1:hover {
            color: var(--anim-border-color);
        }
        
        .anim-border-btn-1:hover::before,
        .anim-border-btn-1:hover::after,
        .anim-border-btn-1:hover span::before,
        .anim-border-btn-1:hover span::after {
             transform: scale(1,1);
        }
        
        .anim-border-btn-1:focus-visible {
            outline: 2px solid var(--anim-border-color);
            outline-offset: 4px;
        }
    </style>
</head>
<body>

<div class="anim-border-container-1">
        <button type="button" class="anim-border-btn-1">
            <span>Hover Me</span>
        </button>
    </div>

</body>
</html>