:root {
  --font-size: 20px;
  font-size: var(--font-size);
}

body {
  font-family: system-ui;
  background: #f06d06;
  color: black;
  text-align: center;
}

main {
  text-align: left;
}

article {
  border-top: solid black;
  border-bottom: solid black;
  padding-bottom: 2rem;
}

article header hgroup h1 {
  margin-bottom: 0.5rem;
}

article header hgroup p {
  margin-top: 0.5rem;
}

article>header {
  text-align: center;
  margin-bottom: 2rem;
}

header>time {
  font-size: 14px;
}

table {
  border: solid black;
}

td,
th {
  border: solid black;
}

thead {
  background-color: lightblue;
}

body>header {
  margin-bottom: 1rem;
}

body {
  margin: 2rem;
}

header>nav {
  display: flex;
  justify-content: space-around;
  max-width: 800px;
  margin: auto;
}

@media screen and (max-width: 300px) {
  header>nav {
    flex-direction: column;
  }
}