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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 CSS Button</title>
    <style>
        /* Basic styling for centering the button */
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f2f5;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

/* Animated Button Styles */
        .animated-button {
            padding: 15px 30px;
            font-size: 1.2em;
            font-weight: bold;
            color: #ffffff; /* Initial text color */
            background-color: #3498db; /* Initial background color */
            border: none;
            border-radius: 8px;
            cursor: pointer;
            overflow: hidden; /* Crucial for containing the pseudo-element */
            position: relative; /* Needed for positioning the pseudo-element */
            transition: color 0.4s ease-out; /* Smooth transition for text color */
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
            outline: none; /* Remove outline on focus */
            z-index: 1; /* Ensure button content is above pseudo-element */
        }

/* Pseudo-element for the animated background slide */
        .animated-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: #2ecc71; /* New background color on hover */
            z-index: -1; /* Place behind the button text */
            transform: translateX(-100%); /* Start completely to the left, outside the button */
            transition: transform 0.4s ease-out; /* Smooth transition for the slide effect */
        }

/* Hover and Focus States */
        .animated-button:hover,
        .animated-button:focus {
            color: #ffffff; /* Text color remains white on hover/focus */
        }

.animated-button:hover::before,
        .animated-button:focus::before {
            transform: translateX(0); /* Slide the background in from the left */
        }

/* Optional: Add a slight scale effect on active (click) */
        .animated-button:active {
            transform: scale(0.98);
            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
        }
    </style>
</head>
<body>
    <button class="animated-button">Hover Me</button>
</body>
</html>

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