#preamble h1, #preamble h2 {
    padding: 0;
    margin: 1em 0;
    border-top: none;
}
#content { border-left: solid; border-right: solid; margin-top: 2rem;}
#content :first-child { margin-top: 0; }
h1,h2,h3,h4,h5,h6 { font-size: 1rem; }
h1, h2 {
    border-top: solid;
    text-align: center;
    width: calc(100% + 2rem);
    position: relative;
    left: -1rem;
    box-sizing: border-box;
    padding: 7rem 1rem 6rem 0;
}
h3 { border-top: solid;
     width: calc(100% + 2rem);
     box-sizing: border-box;
     position: relative;
     left: -1rem;
     margin-top: 2em;
     padding-top: 2em;
     padding-left: 1rem;
     padding-right: 1rem;
     color
   }