<div>
	<button class="noselect red">Darkness</button>
	<button class="noselect green">Darkness</button>
</div>
<div>
	<button class="noselect blue">Darkness</button>
	<button class="noselect purple">Darkness</button>
</div>
* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	height: 100vh;
	overflow: hidden;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	background: #333;
}

.noselect {
  -webkit-touch-callout: none;
    -webkit-user-select: none;
     -khtml-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
		-webkit-tap-highlight-color: transparent;
}

button {
	width: 150px;
	height: 50px;
	cursor: pointer;
	background: #333;
	margin: 10px;
	border: none;
	border-radius: 10px;
	box-shadow: -5px -5px 15px #444, 5px 5px 15px #222, inset 5px 5px 10px #444, inset -5px -5px 10px #222;
	color: #222;
	font-size: 16px;
}

button:hover {
	box-shadow: -5px -5px 15px #444, 5px 5px 15px #222, inset 5px 5px 10px #222, inset -5px -5px 10px #444;
	font-size: 15px;
	transition: 500ms;
}

button:focus {
	outline: none;
}

.red:hover {
	color: #f07171;
	text-shadow: 0px 0px 10px #f07171;
}

.green:hover {
		color: #93f071;
	text-shadow: 0px 0px 10px #93f071;
}

.blue:hover {
	color: #71b7f0;
	text-shadow: 0px 0px 10px #71b7f0;
}

.purple:hover {
	color: #b971f0;
	text-shadow: 0px 0px 10px #b971f0;
}

External CSS

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External JavaScript

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