body {
  font-family: Arial, sans-serif;
  margin: 40px;
  background: #f8f8ff;
}
h1 {
  text-align: center;
}
#convention-list {
  margin-bottom: 20px;
}
.convention {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 12px;
  margin-bottom: 10px;
}
.convention a {
  color: #0077cc;
  text-decoration: none;
}
#map {
  width: 100%;
  height: 400px;
  border-radius: 6px;
  border: 1px solid #ddd;
}