.mainDiv{
  margin-top: 15vh;
  padding: 5vh 5vw;
  
}
h2{
  text-align: center;
}
hr{
  border: none;
  height: 2px;
  background-color: black;
}
iframe{
  width: 80vw;
  height: 45vw;
  border: none;
}