h1 {
    text-align: center;
  }
  
  .out-container {
    max-width: 500px;
    margin: auto;
  }
  
  .header-container {
    display: flex;
    justify-content: center;
  }
  
  textarea {
    width: 100%;
  }
  
  button {
    width: 100%;
  }
  
  .post-container {
    border: solid 2px;
    border-radius: 5px;
    padding: 1em;
    margin-top: 1em;
  }