body {
  font-family: 'Helvetica Neue', 'Helvetica', Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  margin: 0;
  padding: 10px;
}

.article__body {
  max-width: 630px;
}

.button {
  background-color: #4caf50; /* Green */
  border: none;
  color: white;
  padding: 10px 5px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 14px;
}

@media all and (min-width: 1000px) {
  .container {
    max-width: 980px;
    margin: auto;
  }

  .article__sidebar {
    width: 300px;
    margin-left: 50px;
  }
}