.wrapper{
  width: 100%;
  height: 100%;
  margin: 0;
  text-align: center;
}
.quote-box {
  margin: auto; 
  width: 50%;
  border: 3px solid green;
  padding: 20px;
}
.quote-author{
  text-align: right;
}
#buttons {
  vertical-align: bottom;
}