:root {
  background-attachment: fixed;
  background-image: linear-gradient(lightblue, aliceblue);
}

body {
  height: 100%;
  margin: 0;
  padding: 0;
  width: 100%;
}

main {
  margin: 2em;
  text-align: center;
}

header {
  text-align: end;
}

nav {
  align-items: center;
  display: flex;
  justify-content: right;
  margin: 1em;
}

nav a {
  margin: 0.5em;
  text-decoration: none;
}

nav a img {
  height: 2em;
  vertical-align: top;
}

table {
  margin: auto;
}

tr, td {
  border-block: 1px solid black;
  padding: 0.5em;
}

img.easter-egg {
  height: 10em;
}