html, body {
  margin: 0;
  width: 100%;
  height: 100%;
}

a {
  color: #00B7FF;
}

code {
  border: 1px solid gray;
  padding: 3px;
  border-radius: 4px;
  background-color: #ebebeb;
}

th, td {
  text-align: center;
}