Edit in JSFiddle

#header{
  padding: 8px 32px;
  margin-bottom: 16px;
  font-family: Arial, sans-serif;
  background-color: #2e9fff;
}

.news{
  background-color: #ffd42e !important;
}
<div id="header">Любой раздел</div>
<div id="header" class="news">Новости</div>