body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  color: #222;
  background: #fff;
}
header {
  background: #003b57;
  color: #fff;
  padding: 1rem 2rem;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}
h1, h2, h3 {
  color: #003b57;
}
section {
  margin-bottom: 2rem;
}
.lang {
  border-top: 2px solid #003b57;
  margin-top: 3rem;
  padding-top: 2rem;
}
footer {
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  margin: 4rem 0 2rem 0;
}
a {
  color: #003b57;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.logo-div {
    display: inline-block;
    width: 200px;
}
.img-fluid {
    max-width: 100%;
    height: auto;
}