body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
}

.container {
  text-align: center;
}

div {
  display: inline-block;
  margin-right: 10px;
}

label {
  display: block;
  margin-bottom: 5px;
  text-align: center;
}

input, button {
  font-size: 24px;
  padding: 10px;
}

button {
  background-color: #4CAF50;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  opacity: 0.8;
}

button:disabled {
  background-color: gray;
  cursor: not-allowed;
}

.top-btn {
  font-size: 18px;
  padding: 8px 16px;
  background-color: #4CAF50;
  color: white;
  text-decoration: none;
  display: inline-block;
  margin-top: 20px;
  cursor: pointer;
  border-radius: 4px;
}

.top-btn:hover {
  background-color: #45a049;
}