.clear{
  clear: both;
}
div {
  background-color: darkblue;
  color: #fff;
  width: 500px;
  height: 200px;
  margin: 100px auto;
  border-radius: 10px;
  font-size: 20px;
  text-align: center;
  opacity: 0.5;
  transform: rotate(15deg);
  box-shadow: 10px 10px 10px gray;
}

p {
  display: inline-block;
  width: 300px;
  margin-bottom: 0;
  margin-top: calc((200px - 23px - 46px)/2);
}

.author {
  float: right;
  margin-top: 0;
}