JSFiddle - React, Tailwind, and code Playground

HTML

<div id="nav_menu-2" class="header-widget widget_nav_menu header-widget-1 header-widget-num-1">
<div class="menu-secondary-container">
  <ul id="menu-secondary" class="menu">
    <li id="menu-item-115" class="menu-item menu-item-     type-post_type menu-item-object-page menu-item-has-children menu-item-115">
      <a href="http://localhost/careerdishanepal/services/">Services</a>
      <ul class="sub-menu">
	    <li id="menu-item-126" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-126">
          <a href="http://localhost/careerdishanepal/background/">Background</a></li>
	<li id="menu-item-129" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-129">
      <a href="http://localhost/careerdishanepal/market-survey-reports/">Market Survey Reports</a></li>
	<li id="menu-item-131" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-131">
      <a href="http://localhost/careerdishanepal/behind-the-scene/">Behind the scene</a></li>
</ul>
</li>
  <li id="menu-item-116" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-116">
    <a href="http://localhost/careerdishanepal/about-us/">About Us</a>
<ul class="sub-menu">
	<li id="menu-item-128" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-128">
      <a href="http://localhost/careerdishanepal/goals-and-objectives/">Goals and Objectives</a></li>
	<li id="menu-item-130" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-130">
      <a href="http://localhost/careerdishanepal/social-need-assessment-study/">Social Need Assessment Study</a></li>
</ul>
</li>
<li id="menu-item-117" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-117">
  <a href="http://localhost/careerdishanepal/contact/">Contact</a></li>
</ul>
  </div>
</div>

CSS

div#nav_menu-2{
  	float: left!important;
}

div.menu-secondary-container{
  	display: block;
    background-color: #f3e6ff;
	background-size: cover;
	margin: 0px;
	padding: 0px;
	overflow: visible;
	position: static;
}

div#nav_menu-2 ul{
    top: 0px;
    margin: 0px;
}

div#nav_menu-2 ul li{
   	list-style-type: none;
	position: relative;
	display: inline-block;
}

div#nav_menu-2 ul li a{
  	display: block;
	padding: 14px 16px;
	text-align: center;
	line-height: 30px;
	text-decoration: none;
	font-size: 12pt;
	font-weight: bold;
	color: purple;
	text-transform: uppercase;
}

div#nav_menu-2 ul li a:hover{
	background-color: lightgray;
}

div#nav_menu-2 ul li a:active{
	background-color: hotpink;
}

div#nav_menu-2 ul li a:link{
	color: darkpurple;
}

div#nav_menu-2 ul li a:visited{
	color: lightpurple;
}

.active{
	background-color: dimgray;
}

div#nav_menu-2 ul li ul {
  	display:none;
  	clear: both;
  	overflow: auto;
  	white-space: nowrap;
    position:absolute;
}

div#nav_menu-2 ul li:hover ul {
	display: block;
  top: 60px;
  left: 0;
   
}

div#nav_menu-2 ul li li a{
	background-color: lightgray;
	padding: 14px 16px;
	min-width: 160px;
	display: block;
	text-align: center;
}

div#nav_menu-2 ul li ul li {
  display: block;
}