.preview {
  margin: 20px;
  padding: 20px;
  border: 1px solid #ccc;
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  border-radius: 3px;
}
.post {
  background: white;
  padding: 60px;
  width: 80%;
  border: 1px solid #ccc;
}
.content {
  width: 80%;
}