body {
  font-family: Arial;
  background: #f4f4f4;
}

.container {
  width: 600px;
  margin: auto;
  margin-top: 50px;
  background: white;
  padding: 20px;
  border-radius: 10px;
}

textarea {
  width: 100%;
  height: 150px;
  margin-top: 10px;
}

button {
  margin-top: 10px;
  padding: 10px;
}

.hidden {
  display: none;
}

#timer {
  font-size: 20px;
  color: red;
  margin-top: 10px;
}