body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.navbar {
  background-color: #4CAF50;
  overflow: hidden;
}

.navbar a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.navbar a:hover {
  background-color: #45a049;
}

.calculator {
  max-width: 600px;
  margin: 50px auto;
  padding: 20px;
  background-color: #f5f5f5;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.calculator h1 {
  text-align: center;
  color: #333;
}

label {
  display: block;
  margin: 10px 0 5px;
  color: #555;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 10px;
  box-sizing: border-box;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

.calculator h3 {
  margin-top: 20px;
  color: #333;
}

.result-box {
  background-color: #4CAF50;
  color: white;
  padding: 10px;
  border-radius: 5px;
  margin-top: 10px;
}

#vanResult, #tirResult {
  margin-bottom: 10px;
  color: #333;
}