body {
  background-color: rgb(143, 188, 143);
}

#song{
  width: 400px;
  height: 300px;
  margin: auto;
  justify-content : center;
  background-color: rgba(0, 0, 0, 0.75);
  border-radius: 10px;
  color: #fff;
}

.btn {
  width: 100px;
	height: 60px;
	border-radius: 5px;
	border: #f54e4e;
	background-color: #f54e4e;
	color: #fff;
	transition: 0.5s ease all;
	outline: none;
	cursor: pointer;
	text-align: center;
	margin: auto;
	justify-content : center;

}

.btn:hover {
  color: #f54e4e;
	background-color: #fff;
}

.btn-wrap {
	max-width: 250px;
	margin: auto;
	display: -webkit-flex;
	display: -moz-flex;
	display: -ms-flex;
	display: -o-flex;
	display: flex;
}

h1 {
  text-align: center
}

DIV {
  text-align: center
}