.content {
	max-width: 860px;
}

#zona {
	box-sizing: content-box;
	position: relative;
	width: 800px;
	max-width: 100%;
	height: 500px;
	background-color: #000;
	margin: 1.5rem auto;
	border: 2px solid #555;
	border-radius: 0.3rem;
}

#plataforma {
	width: 100px;
	height: 20px;
	background-color: #3498db;
	position: absolute;
	top: 465px;
	left: 350px;
}

#pelota {
	width: 10px;
	height: 10px;
	background-color: #fff;
	position: absolute;
	top: 245px;
	left: 395px;
	border-radius: 5px;
}

.ladrillo {
	width: 50px;
	height: 25px;
	background-color: #e74c3c;
	position: absolute;
}