h2 {
  text-align: center;
  color: #0b6b60;
  font-size: 30px;
  margin-top: 20px;
}

main p { 
    max-width:800px; 
    margin:0 auto 15px auto; 
    text-align:center; 
}

iframe { 
    display: block;
    margin: 0 auto;
    width: 75%;
    height: 350px; 
    border: 0;
    border-radius: 10px; 
    box-shadow: 0 5px 5px rgba(0,0,0,0.3);
}