header a {
  text-decoration: none;
  color: black;
  font-family: "Times New Roman", Times, serif;
  font-size: x-large;
  letter-spacing: 0.1em;
  font-weight: 300;
}
header {
  text-align: left;
  margin-left: 1em;
  padding: 2em;
}
header a:hover {
  font-weight: 900;
}