html {
  height: 100%;
}

body {
  background-color: #f6f6f6;
  color: #424242;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Open Sans",
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 18px;
  font-weight: 400;
  line-height: 1.65;
  height: 100%;
  margin: 0;
  display: flex;
  flex-flow: column;
  justify-content: space-between;
}

a:link,
a:visited {
  color: #424242;
  text-decoration: none;
}

a:hover,
a:active {
  color: #424242;
  text-decoration: underline;
}

header {
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-flow: row;
  flex-wrap: wrap;
}

h1 {
  font-size: 24px;
  margin: 24px 0;
  font-weight: 300;
  text-align: center;
}

@media (min-width: 768px) {
  h1 {
    font-size: 30px;
    margin: 30px 0;
  }
}

@media (min-width: 992px) {
  h1 {
    font-size: 36px;
    margin: 36px 0;
  }
}

main img {
  width: 225px;
  height: 225px;
  border: 0;
}

footer p {
  text-align: center;
  margin: 18px 0;
}