body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-image: url('https://media.istockphoto.com/id/868098786/photo/thermometer-on-snow-shows-low-temperatures-zero-low-temperatures-in-degrees-celsius-and.jpg?s=612x612&w=0&k=20&c=jOZH4RSlX29thO6GNlvTUlYKUo_DK4xVxvXUTK7Jw5s=');
  background-size: cover;
  background-position: center;
  color: #fff;
}

h1 {
  text-align: center;
  margin-top: 30px;
  font-size: 2.5rem;
  text-shadow: 2px 2px 4px #000;
}

.converter {
  max-width: 350px;
  margin: 30px auto;
  padding: 25px;
  background-color: rgba(0, 0, 0, 0.7);
  border-radius: 10px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
}

.input-group {
  display: flex;
  margin-bottom: 15px;
  align-items: center;
}

.input-group label {
  width: 90px;
  font-weight: bold;
}

.input-group input,
.input-group select {
  flex-grow: 1;
  padding: 8px;
  border: none;
  border-radius: 5px;
  font-size: 1rem;
}

.convert-btn {
  display: block;
  width: 100%;
  padding: 12px;
  margin-top: 15px;
  background-color: #ff4081;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.convert-btn:hover {
  background-color: #e91e63;
}

.result {
  text-align: center;
  margin-top: 15px;
  font-size: 1.2rem;
  font-weight: bold;
}