:root {
  --bg-primary: white;
  --bg-secondary: #2a3a60;
  --font-primary: black;
  --font-secondary: #cac3f0;
}

html {
  font-size: 16px;
  color: var(--font-primary);
}

header {
  color: var(--font-secondary);
  background-color: var(--bg-secondary);
}

header a {
  text-decoration: none;
  color: var(--font-secondary);
  font-weight: 600;
}

header h1 {
  text-transform: uppercase;
  margin: 5px auto;
}

header img {
  width: 100%;
}

p {
  font-size: 14px;
  margin: 5px auto;
}

img,
nav,
p,
aside,
h1,
h2,
li {
  padding: 10px;
}

main p,
footer p {
  background-color: var(--bg-secondary);
  color: var(--font-secondary);
  margin: 5px auto;
}

footer p,
footer h1,
footer h2,
footer a {
  font-size: 12px;
  margin: 5px auto;
}

article,
section {
  margin: 20px auto;
}

#books {
  width: 100%;
  border-collapse: collapse;
}

td,
th {
  border: solid 1px var(--bg-secondary);
  text-align: left;
}

td {
  padding: 8px;
}

th {
  padding: 12px 8px;
  text-align: center;
  background-color: var(--bg-secondary);
  color: var(--font-secondary);
}

tr:nth-child(2n) {
  background-color: gainsboro;
}

tr:hover {
  background-color: blanchedalmond;
}