body {
  width: 75%;
  margin-left: auto;
  margin-right: auto;
}
.sidenote {
  font-size: 0.7rem;
  float: left;
  width: 12.5%;
  margin-left: -15%;
  position: relative;
}
table, th, td {
  border: 1px solid black;
}
table.center {
  margin-left:auto;
  margin-right:auto;
}
.centerimg {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}