body {
  margin: 0;
  background-color: #eef1f4;
  color: #252525;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}
header {
  background-color: #dbe6ef;
  padding: 1.5rem 5vw 0;
  text-align: center;
}
h1 {
  color: #23445e;
  font-size: 2rem;
  font-weight: bold;
  text-shadow: 1px 1px 2px #fff;
}
h2 {
  color: #23445e;
  font-size: 1.4rem;
  text-shadow: 1px 1px 1px #ddd;
  margin-top: 1.5rem;
}
p { margin: 0.8rem 0; }
a { color: #225780; }
a:hover { color: #15364f; }
nav {
  background-color: #23445e;
  padding: 0.7rem;
  text-transform: uppercase;
}
nav a {
  display: inline-block;
  margin: 0.2rem 0.7rem;
  color: #fff;
  text-decoration: none;
}
nav a:hover, nav a[aria-current="page"] {
  color: #ffe09a;
  text-decoration: underline;
}
main {
  width: 88%;
  max-width: 52rem;
  margin: 1.5rem auto;
  padding: 1.2rem;
  background-color: white;
  border: 1px solid #bbc7d0;
  box-sizing: border-box;
}
#intro { min-height: 40vh; }
section {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid #9cb6ca;
}
ul {
  list-style-type: square;
  list-style-position: outside;
  padding-left: 1.5rem;
}
ol {
  list-style-type: decimal;
  list-style-position: outside;
  padding-left: 1.5rem;
}
dl { background-color: #f1f5f8; padding: 1rem; }
dt { font-weight: bold; }
dd { margin: 0 0 0.8rem 1rem; }
.highlight { background-color: #fff4d4; padding: 0.8rem; }
.note { color: #4c4c4c; font-style: italic; font-size: 0.9rem; }
figure { margin: 1rem 0; }
img { max-width: 100%; height: auto; border: 1px solid #bbc7d0; }
input, textarea {
  width: 100%;
  max-width: 26rem;
  padding: 0.5rem;
  font: inherit;
  border: 1px solid #777;
  box-sizing: border-box;
}
button {
  padding: 0.5rem 0.8rem;
  font: inherit;
  background-color: #dbe6ef;
  color: #252525;
  border: 1px solid #647d91;
  cursor: pointer;
}
blockquote { font-style: italic; }
hr { border: 0; border-top: 1px solid #bbc7d0; }
footer { text-align: center; padding: 0.5rem 5vw 1rem; font-size: 0.9rem; }
@media (max-width: 36rem) {
  main { width: 94%; padding: 0.8rem; }
  h1 { font-size: 1.6rem; }
  nav a { margin: 0.2rem 0.4rem; }
}