body {
  font-family: sans-serif;
  margin: 2rem;
  background: #f7f7f7;
  color: #333;
}
h1, h2, h3 {
  color: #004080;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.site-header nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #004080;
}

.welcome {
  font-weight: bold;
}
a {
  margin-right: 20px;
}

ul {
  padding-left: 1rem;
}

li {
  list-style: none;
  border-left: 3px solid #004080;
  padding-left: 1rem;
  margin-bottom: 1rem;
}

.error {
  color: red;
  font-weight: bold;
}

.site-footer {
  margin-top: 2rem;
  text-align: center;
  color: #666;
}