h1{
border-bottom: 2px solid black;
}
h2{
border-bottom: 1px solid black;
}
h1 {
font-size: 2.0rem;
}
blockquote {
padding-left: 1rem;
border-left: 0.5rem solid turquoise;
font-style: italic;
}
iframe {
margin-left:auto;
margin-right:auto;
display:block;
}