body {
  margin: 0;
  padding: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background-color: #f9f9f9;
  color: #333;
}

#app {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  text-align: center;
}

input[type="text"] {
  padding: 10px;
  font-size: 16px;
  width: 60%;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-right: 10px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  background-color: #69b3a2;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #57a18f;
}

#graph {
  margin-top: 40px;
  border: 1px solid #ddd;
  background-color: #ffffff;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
  height: 600px;
  overflow: hidden;
}