body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 50px;
}

.container {
  background: #fff;
  padding: 20px 30px;
  border-radius: 8px;
  width: 80%;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  text-align: center;
}

h2 {
  margin-bottom: 20px;
}

#timer {
  font-size: 1.2em;
  margin-bottom: 20px;
  color: #333;
}

button {
  padding: 10px 15px;
  margin: 5px;
  border: none;
  background: #007bff;
  color: white;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1em;
}

button:hover {
  background: #0056b3;
}

#preview {
  width: 100%;
  max-height:calc(100vh - 100px);
  background: black;
  margin-top: 20px;
  border-radius: 5px;
}