body {
  font-family: 'Comic Neue', sans-serif;
  background-color: #f0f8ff;
  margin: 0;
  padding: 0;
}

header {
  background-color: #4caf50;
  color: white;
  padding: 1em;
  text-align: center;
}

nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
}

main {
  padding: 2em;
}

.builder {
  background-color: #ffffff;
  border-radius: 10px;
  padding: 2em;
  max-width: 500px;
  margin: auto;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.selectors select {
  margin: 10px;
  padding: 10px;
  font-size: 1em;
}

button {
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  font-size: 1em;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.output {
  margin-top: 20px;
  background-color: #e8f5e9;
  padding: 1em;
  border-radius: 5px;
}