body {
  font-family: sans-serif;
  max-width: 600px;
  margin: 20px auto;
}

textarea {
  width: 100%;
  font-size: 14px;
}

button {
  padding: 5px 10px;
  font-size: 14px;
  margin-top: 5px;
}

.post {
  padding: 8px;
  border: 1px solid #ccc;
  margin-bottom: 5px;
  border-radius: 4px;
  background: #f9f9f9;
}