:root {
  --primary: #000;
  --bg-primary: #fff;
  --secondary: #fff;
  --bg-secondary: #507b34;

}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: "Roboto Slab", sans-serif;
  height: 100%;
}

nav a {
  vertical-align: middle;
}

a:link,
a:visited {
  color: var(--primary);
}

a:hover {
  color: var(--bg-secondary);
}

body {
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  text-align: center;
}

header {
  box-shadow: 0 0 20px rgb(0 0 0 / 10%);
  padding: 2ex 1ex;
}

header > div {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  max-width: 100ex;
}

.logo a {
  text-decoration: none;
}

.logo {
  font-size: 1.5em;
}

nav a {
  margin: 0.5em;
}

main > p {
  text-align: center;
}

main img {
  display: block;
  margin: 0 auto;
  width: 100%;
}

article {
  text-align: left;
}

header > *,
main,
footer > * {
  max-width: 80ex;
  margin: 0 auto;
  width: 100%;
  padding: 1ex;
}

nav ul {
  list-style: none;
}

footer {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2ex 1ex;
}

footer img {
  width: 30px;
  height: 30px;
  margin: 0 5px;
}

.social a {
  text-decoration: none;
}

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

.secondary a {
  color: var(--secondary);
}

.secondary a:hover {
  color: #eee;
}