body {
  font-family: sans-serif;
  margin: 20px;
  background-color: #f9f9f9;
}

header {
  background: #333;
  color: white;
  padding: 10px;
  text-align: center;
}

#new-post {
  margin-top: 30px;
}

#new-post input,
#new-post textarea {
  display: block;
  width: 100%;
  margin-bottom: 10px;
  padding: 10px;
}

.post {
  background: white;
  padding: 15px;
  margin-top: 20px;
  border-left: 5px solid #333;
}