.gameboy {
	background-color: #8BDCFE;
	border: 10px solid #717171;
	border-radius: 20px;
	box-shadow: 0 0 0 20px #8BDCFE, 
				0 0 0 25px #717171;
	padding: 20px;
	position: relative;
}

.simon {
	display: flex;
	flex-wrap: wrap;
	width: 300px;
	height: 300px;
	margin: auto;
	margin-top: 50px;
	border: 5px solid black;
	border-radius: 20px;
}

.pad {
	flex-basis: 50%;
	height: 50%;
	box-sizing: border-box;
	position: relative;
}

.green {
	background-color: green;
	border-top-left-radius: 20px;
}

.red {
	background-color: red;
	border-top-right-radius: 20px;
}

.yellow {
	background-color: yellow;
	border-bottom-left-radius: 20px;
}

.blue {
	background-color: blue;
	border-bottom-right-radius: 20px;
}

.active {
	box-shadow: inset 0 0 30px rgba(255,255,255,0.5), 
				inset 0 0 20px rgba(255,255,255,0.5),
				inset 0 0 10px rgba(255,255,255,0.5);
}

.gradient {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-image: linear-gradient(to bottom right, rgba(255,255,255,0.8), rgba(255,255,255,0.2));
}

button {
	display: block;
	margin: auto;
	margin-top: 50px;
	font-size: 20px;
	padding: 10px 20px;
	border-radius: 10px;
	border: none;
	background-color: #4CAF50;
	color: white;
}

button:hover {
	background-color: #3e8e41;
	cursor: pointer;
}

#restart {
	position: absolute;
	top: 10px;
	right: 10px;
}