* {
  margin: 0;
  position: relative;
}
header {
  padding: 40px 0;
  box-sizing: border-box;
  background-color: yellowgreen;
  border: solid blue 4px;
  font-family: "Comic Sans MS", sans-serif;
  text-align: center;
}
main {
  padding: 10px;
  padding-bottom: 5.5rem;
  font-family: Tahoma, sans-serif;
  font-size: 20px;
  background-color: #eeeeee;
}
main h3 {
  margin-top: 8px;
  font-family: "Comic Sans MS", Courier;
}
th,
td {
  border: 1px solid black;
  border-collapse: collapse;
  padding: 5px;
  text-align: center;
}
footer {
  position: absolute;
  padding: 10px;
  box-sizing: border-box;
  font-family: Tahoma, sans-serif;
  bottom: 0;
  width: 100%;
  height: 4.5rem;
  background-color: darkorange;
  border: solid darkgreen 4px;
}
footer a {
  padding: 1px 4px 3px 4px;
  transition: color 250ms, background-color 250ms;
}
footer a:hover {
  color: white;
  background-color: red;
}