.inbox-categories {
  border-top: 1px solid #ddd;
  margin-top: 52px;
  padding-top: 5px;
}

.inbox-category-link {
  display: block;
  padding: 5px 5px 5px 10px;
  margin-top: 5px;
  &.active {
    font-weight: bold;
    color: #FFF;
    background-color: #2c3e50;
    &:hover { text-decoration: none; }
  }
}