Change Ul Li From Horizontal To Vertical

I am trying to do a Menu that will appear when Window width is resized to a small resolution. Below is the HTML and CSS are below

Solution 1:

nav{
    position:relative;
}
nav ul
{
    position:absolute;
    top:40px; /* this height is same as the menu.png */
    left:0;
    z-index:999;
    list-style:none;
}
nav li{
    list-style:none;
    display:block;
}
nav ul li a{
    display:block;
}
nav li:not(:first-child) > :only-child,
nav ul > :first-child a{
   text-decoration:none;
   font-size:1.4em !important;
   outline:1px solid blue;
   padding:8px;
   letter-spacing:0.9px;
   margin-left:18px;
}  
nav li:not(:first-child) > :only-child{
   color:blue;
}
nav ul > :first-child a{
  color:white !important;
  background:blue;
}

<nav>
 <a id="menu-dropdown"><img src="http://localhost/influenza/logo/menu.png" /></a>
 <ul>
    <li><a class="tab-click" href="http://localhost/influenza/index.php">Home</a></li>
    <li><a href="http://localhost/influenza/articles.php">Articles</a></li>
    <li><a href="http://localhost/influenza/webinars.php">Webinars</a></li>
 </ul>
</nav>

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