style.css

body {
  margin: 0;
}
aside {
  width: 25%;
  position: fixed;
  left: 5%;
}
main {
  width: 55%;
  float: right;
  position: relative;
  right: 5%;
}
main h2 {
  position: sticky;
  position: -webkit-sticky;
  background-color: white;
  padding: 20px 0;
  width: 100%;
  margin: 0;
  top: 0px;
  z-index: 1;
}
fieldset {
  width: 100%;
  padding: 20px;
  margin-top: 20px;
}
p {
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  position: relative;
  margin-bottom: 30px;
}
th {
  background-color: lightgray;
  position: sticky;
  position: -webkit-sticky;
  top: 67px;
  left: 0;
}
td,
th {
  padding: 5px 10px;
  width: 30%;
}
tbody {
  padding-top: 200px;
}
tbody tr:not(:nth-of-type(1)) {
  border-top: 1px solid lightgray;
}
td:first-of-type,
th:first-of-type {
  text-align: right;
  width: 10%;
}
td:last-of-type,
th:last-of-type {
  text-align: right;
  width: 15%;
}