body {
  margin-top: 30px;
}

.content-block, .sub-content-block{
  max-width: 550px;
  margin: 0 auto;
}

.content-block{
  border-radius: 20px;
  border: 1px solid lightgray;
  padding: 20px;
}


.sub-content-block{
  padding: 10px 20px;
  margin-bottom: 20px;
}