#content .react-tabs {
  .item > .button {
    opacity: 0;
    transition: opacity .25s ease-in-out;
    font-size: 0.5em;
    margin: -0.5em -1em 0 1.5em;
    display: 'none';
  }

  .item.active:hover > .button {
    opacity: 1;
  }
}

#content .react-tabs > ul {
  .item > .button {
    opacity: 0;
    transition: opacity .25s ease-in-out;
    font-size: 0.5em;
    margin: -0.5em -1em 0 1.5em;
    display: none;
  }

  .item.active:hover > .button {
    opacity: 1;
  }
}

Change the scope for only the tab and use correct value for display attr
Change the scope for only the tab and use correct value for display attr