* {
  font-family: 'OpenSans';
  text-align: center;
  box-sizing: border-box;
}

body[flex-box] {
  border-top: 5px solid #0266c8;
  height: 80vh;
  min-height: 600px;
  padding: 20px;
}

header h1 {
  font-size: 5em;
  margin: 0;
}
header h3 {
  font-weight: 300;
  font-size: 2.5em;
  margin-top: 0;
}

#content {
  padding: 2.5em;
  margin: 2.5em;
  border-top: 1px solid #0266c8;
  border-bottom: 1px solid #0266c8;
}

footer {
  margin: 1.3em 1.3em 0;
  font-size: 0.8em;
}

footer span {
  display: inline-block;
  margin-top: 5px;
  font-weight: 300;
}

a {
  color: #0266c8;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

@media (max-width: 600px) {
  header h1 {
    font-size: 3em;
  }
  header h3 {
    font-size: 1.8em;
  }
  #content {
    padding: 2em;
    margin: 2em;
  }
}

@media (max-width: 375px) {
  header h1 {
    font-size: 2em;
  }
  header h3 {
    font-size: 1.3em;
  }
  #content {
    padding: 1.5em;
    margin: 1.5em;
  }
}