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

#container {
  margin: 50px auto;
  width: 80%;
  max-width: 800px;
}

h1 {
  text-align: center;
}

#input,
#output {
  width: 100%;
  height: 200px;
  font-size: 16px;
  padding: 10px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  resize: none;
}

button {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin-right: 10px;
  cursor: pointer;
}

button:hover {
  background-color: #3e8e41;
}

@media (max-width: 600px) {
  #container {
    width: 90%;
  }
}