html,
body {
  height: 100%;
  background-color: burlywood;
}

html,
body,
p {
  margin: 0;
  padding: 0;
}

footer,
nav {
  height: 18.5px;
  padding: 15px;
}
main {
  display: flex;
  flex-wrap: wrap;
}
img,
article {
  max-width: 32%;
  min-width: 400px;
  margin: 20px auto;
}
img {
  max-width: 350px;
}

.navigation:hover {
  font-size: 18px;
  color: brown;
  cursor: pointer;
}