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HTML 

              
                <nav class="flex justify-between ph3 bg-light-gray">
  <ul class="flex flex-shrink-0 list ma0 pa0">
    <li><a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray">Admin Home</a></li>
    <li class="relative">
      <a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray js-has-dropdown" aria-expanded="false">Events<span class="dib ml1 v-mid bw2 bt bt--dashed bt-1 br br--transparent br-1 bl bl--transparent bl-1 bb-0"></span></a>
      <ul class="dn absolute list bg-mid-gray pa2">
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">Manage Events</a></li>
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">Create New</a></li>
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">Edit Existing / Duplicate</a></li>
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">View Past</a></li>
      </ul>
    </li>
    <li class="relative">
      <a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray js-has-dropdown" aria-expanded="false">Users<span class="dib ml1 v-mid bw2 bt bt--dashed bt-1 br br--transparent br-1 bl bl--transparent bl-1 bb-0"></span></a>
      <ul class="dn absolute list bg-mid-gray pa2">
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">Create User</a></li>
        <li><a href="#" class="db no-underline ph2 pv1 sans-serif light-gray hover-bg-near-white hover-dark-gray nowrap">Edit User</a></li>
      </ul>
    </li>
    <li><a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray">Manage Statuses</a></li>
    <li><a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray">Information</a></li>
  </ul>
  <ul class="flex list ma0 pa0">
    <li class="br b--light-silver">
      <strong class="dib pt3 pr0 pb3 pl2 sans-serif dark-gray">Logged in as:</strong>
      <span class="dib pt3 pr2 pb3 pl0 sans-serif i dark-gray">Jim Bob</span>
    </li>
    <li class="br b--light-silver">
      <a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray">Home</a>
    </li>
    <li>
      <a href="#" class="dib pv3 ph2 no-underline sans-serif dark-gray hover-bg-near-black hover-light-gray">Log out</a>
    </li>
  </ul>
</nav>
!

CSS 

              
                /* CUSTOM TACHYON LIKE CLASSES */

.bt--dashed {
  border-top-style: dashed;
}

.bl--transparent {
  border-left-color: transparent;
}

.br--transparent {
  border-right-color: transparent;
}
!

JS 

              
                // Made to be used with Tachyons CSS classes
const initDropdowns = (function() {
  const _dropdownTriggers = document.querySelectorAll(".js-has-dropdown");
  const _toggleDropdown = e => {
    e.stopPropagation();
    e.preventDefault();
    const trigger = e.target;

    _dropdownTriggers.forEach(el => {
      // Close sibling dropdowns
      if (el !== trigger) {
        _resetTarget(el);
      }
    });

    const expanded = trigger.getAttribute("aria-expanded");
    const target = trigger.nextElementSibling;

    // 'Toggle' dropdown menu
    if (expanded === "false") {
      target.classList.remove("dn");
      trigger.setAttribute("aria-expanded", "true");
    } else {
      target.classList.add("dn");
      trigger.setAttribute("aria-expanded", "false");
    }
  };
  const _closeAllDropdowns = () => {
    _dropdownTriggers.forEach(trigger => {
      _resetTarget(trigger);
    });
  };

  function _resetTarget(el) {
    const target = el.nextElementSibling;

    target.classList.add("dn");
    el.setAttribute("aria-expanded", "false");
  }

  function init() {
    // Add events to all dropdown triggers
    _dropdownTriggers.forEach(trigger => {
      trigger.addEventListener("click", _toggleDropdown, false);
    });

    // Close dropdowns when clicking on the document
    document.addEventListener("click", _closeAllDropdowns);
  }

  return {
    init: init
  };
})();

initDropdowns.init();
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999px

Console