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HTML 

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Responsive Minimal Button</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="button-container">
        <button class="minimal-button"><span>Click me</span>
            <div class="fill-animation"></div>
            <div class="color-layer red"></div>
            <div class="color-layer green"></div>
            <div class="color-layer blue"></div>
            <div class="color-layer orange"></div>
            <div class="color-layer purple"></div>
            <div class="color-layer indigo"></div>
            <div class="color-layer yellow"></div>
        </button>
    </div>
</body>
</html>
!

CSS 

              
                /* General page styles */
body {
    background-color: #081f5c; /* Page background color */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif; /* Font family */
}

/* Button container */
.button-container {
    text-align: center;
}

/* Minimal button styles */
.minimal-button {
    position: relative;
    font-size: 16px; /* Font size */
    padding: 10px 20px;
    color: white; /* Normal text color */
    background-color: transparent; /* Normal button background */
    border: 2px solid white; /* Border color */
    cursor: pointer;
    overflow: hidden; /* Ensures overflow content is hidden */
    text-decoration: none; /* Remove underline */
    display: inline-block;
    position: relative;
    transition: transform 0.3s ease; /* Smooth transform effect */
}

.minimal-button span {
    position: relative;
    z-index: 3; /* Ensures text is above the hover effects */
    display: inline-block;
    transition: color 0.3s ease; /* Smooth color transition */
}

/* Fill animation */
.fill-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: white; /* Fill color */
    z-index: 1;
    transition: width 1s ease;
}

.minimal-button:hover .fill-animation {
    width: 100%;
}

/* Color layers */
.color-layer {
    position: absolute;
    top: 0;
    left: 1;
    width: 0;
    height: 100%;
    z-index: 0;
}

.red { background-color: red; }
.green { background-color: green; }
.blue { background-color: blue; }
.orange { background-color: orange; }
.purple { background-color: purple; }
.indigo { background-color: indigo; }
.yellow { background-color: yellow; }

.minimal-button:hover .red {
    animation: slideRed 0.8s linear forwards;
}
.minimal-button:hover .green {
    animation: slideGreen 0.7s linear forwards 0.8s;
}
.minimal-button:hover .blue {
    animation: slideBlue 0.6s linear forwards 1.5s;
}
.minimal-button:hover .orange {
    animation: slideOrange 0.5s linear forwards 2.1s;
}
.minimal-button:hover .purple {
    animation: slidePurple 0.4s linear forwards 2.6s;
}
.minimal-button:hover .indigo {
    animation: slideIndigo 0.3s linear forwards 3s;
}
.minimal-button:hover .yellow {
    animation: slideYellow 0.2s linear forwards 3.3s;
}

/* Slide animations */
@keyframes slideRed {
    to { width: 100%; }
}
@keyframes slideGreen {
    to { width: 100%; }
}
@keyframes slideBlue {
    to { width: 100%; }
}
@keyframes slideOrange {
    to { width: 100%; }
}
@keyframes slidePurple {
    to { width: 100%; }
}
@keyframes slideIndigo {
    to { width: 100%; }
}
@keyframes slideYellow {
    to { width: 100%; }
}

/* Text color change on hover */
.minimal-button:hover span {
    color: black; /* Text color on hover */
}

/* Button sink animation on click */
.minimal-button:active {
    transform: translateY(2px);
}

/* Reverse animation on hover out */
.minimal-button:not(:hover) .fill-animation,
.minimal-button:not(:hover) .color-layer {
    width: 0;
    transition: width 1s ease;
}
!

JS
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