body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0 auto;
  max-width: 900px;
  padding: 1em;
  background-color: #fdfdfd;
  color: #222;
}
header {
  text-align: center;
  padding: 20px;
}
.header-img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 10px;
}
ul {
  list-style: square;
  padding-left: 1.2em;
}
a {
  color: #005bbb;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}