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

.fpsconverter-container {
  max-width: 800px;
  margin: auto;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.fpsconverter-container h1 {
  text-align: center;
  margin-bottom: 20px;
}

.fpsconverter-container label {
  display: block;
  margin-top: 10px;
}

.fpsconverter-container input,
.fpsconverter-container select {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
}

.btn {
  margin-top: 15px;
  padding: 10px 15px;
  background: green;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 5px;
}

.btn:hover {
  background: darkgreen;
}