body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f4f9;
  color: #333;
}
header {
  background: #2b2d42;
  color: white;
  padding: 1rem;
  text-align: center;
}
.input-group {
  margin-top: 0.5rem;
  display: flex;
  justify-content: center;
}
.input-group input {
  width: 60%;
  padding: 0.5rem;
  border: none;
  border-radius: 4px 0 0 4px;
}
.input-group button {
  padding: 0.5rem 1rem;
  border: none;
  background: #ef233c;
  color: white;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
}
.input-group button:hover {
  background: #d90429;
}
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
}
.board {
  width: 50%;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.status {
  margin-top: 1rem;
  font-size: 1.2rem;
  font-weight: bold;
}