body {
  font-family: "Segoe UI", sans-serif;
  background-color: #e6f2ff;
  color: #000;
  margin: 0;
  padding: 0;
}

header {
  background-color: #0099ff;
  color: white;
  padding: 20px;
  text-align: center;
}

nav a {
  margin: 0 12px;
  color: white;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 30px;
}

.welcome-box {
  background-color: #ffffff;
  border-left: 6px solid #0099ff;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 2px 2px 8px #ccc;
}

.theme {
  color: #0099ff;
  font-weight: bold;
}

.start-tip h3 {
  margin-bottom: 10px;
}

.start-tip ul {
  list-style: none;
  padding-left: 0;
}

.start-tip li {
  padding: 8px 0;
  font-size: 1.1em;
}