:root {
  --clr-1: #000;
  --clr-2: #fff;
  --w-column: 800px;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--clr-1);
  color: var(--clr-2);
  font-family: sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-flow: column;
  font-size: large;
}

section {
  padding: 40px;
  width: 100%;
  max-width: var(--w-column);
  box-sizing: border-box;
}

a {
  color: currentColor;
}

nav > a {
  text-decoration: none;
  font-size: 2em;
}

table {
  width: 100%;
  border-spacing: 2px;
}

td {
  background-color: rgba(255, 255, 255, .15);
  padding: 10px;
}

xmp {
  display: inline;
  font-family: monospace;
}

.sign {
  display: flex;
  justify-content: center;
  font-size: 160px;
}