body {
  font-family: Arial, sans-serif;
  background: #f7f9f9;
  display: flex;
  justify-content: center;
  padding: 20px;
}

.app {
  width: 400px;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 12px;
  padding: 20px;
}

h1 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  text-align: center;
}

#tweet-form {
  display: flex;
  gap: 8px;
  margin-bottom: 15px;
}

#tweet-input {
  flex: 1;
  padding: 6px;
}

#feed .tweet {
  background: #e8f5fe;
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 10px;
}