body {
	margin: 0;
	padding: 0;
	background: #f0f0f0;
	color: #000;
}

.parent{
  position: relative;
  height: 600px;
  /* width: 300px; */
}

.content {
  max-width: 600px;
  height: 500px;
  top: 50px;
  bottom: 0;
  left: 0;
  right: 0;
  position: absolute;
  margin: auto;
}

.subject {
  overflow:auto;
  background-color: #ffffff;
  padding: 15px 30px;
  height:420px;
}