how to add subsmenu on creative css3 animation menus by codrops - css

Question

I'm using Creative CSS3 Animation Menus by CODROPS which the Demo can be seen HERE
I want to make a subsmenu at Tetapan(setting) when user hover the mouse at it LIKE THIS .
This is my code that I try to put arrow at the subsmenu
This is css code
#font-face {
font-family: 'WebSymbolsRegular';
src: url('websymbols/websymbols-regular-webfont.eot');
src: url('websymbols/websymbols-regular-webfont.eot?#iefix') format('embedded-opentype'),
url('websymbols/websymbols-regular-webfont.woff') format('woff'),
url('websymbols/websymbols-regular-webfont.ttf') format('truetype'),
url('websymbols/websymbols-regular-webfont.svg#WebSymbolsRegular') format('svg');
font-weight: normal;
font-style: normal;
}
.ca-menu{
padding:0;
margin:5px auto;
width: 145px;
}
.ca-menu li{
width: auto;
height: 50px;
overflow: hidden;
position: relative;
display: block;
background: #fff;
-webkit-box-shadow: 1px 1px 2px rgba(0,0,0,0.2);
-moz-box-shadow: 1px 1px 2px rgba(0,0,0,0.2);
box-shadow: 1px 1px 2px rgba(0,0,0,0.2);
margin-bottom: 4px;
-webkit-transition: all 300ms ease-in-out;
-moz-transition: all 300ms ease-in-out;
-o-transition: all 300ms ease-in-out;
-ms-transition: all 300ms ease-in-out;
transition: all 300ms ease-in-out;
}
.ca-menu li:last-child{
margin-bottom: 0px;
}
.ca-menu li a{
text-align: left;
width: 100%;
height: 100%;
display: block;
color: #333;
position: relative;
}
.ca-icon{
font-family: 'WebSymbolsRegular', cursive;
font-size: 20px;
color: #333;
text-shadow: 0px 0px 1px #333;
line-height: 25px;
position: absolute;
width: 9px;
left: 2px;
text-align: center;
-webkit-transition: all 300ms linear;
-moz-transition: all 300ms linear;
-o-transition: all 300ms linear;
-ms-transition: all 300ms linear;
transition: all 300ms linear;
}
.ca-content{
position: absolute;
left: 30px;
width: 370px;
height: 60px;
top: 5px;
}
.ca-main{
line-height: 25px;
font-size: 15px;
-webkit-transition: all 300ms linear;
-moz-transition: all 300ms linear;
-o-transition: all 300ms linear;
-ms-transition: all 300ms linear;
transition: all 300ms linear;
}
.ca-sub{
font-size: 14px;
color: #666;
}
.ca-menu li:hover{
background-color: #000;
}
.ca-menu li:hover .ca-icon{
color: #f900b0;
font-size: 120px;
opacity: 0.2;
left: -20px;
-webkit-transform: rotate(20deg);
-moz-transform: rotate(20deg);
-ms-transform: rotate(20deg);
transform: rotate(20deg);
}
.ca-menu li:hover .ca-main{
color: #f900b0;
opacity: 0.8;
}
.ca-menu li:hover .ca-sub{
color: #fff;
opacity: 0.8;
}
/** Here I add arrow **/
.has-sub>a::after {
content: '';
position: absolute;
top: 20px;
right: 5px;
width: 0px;
height: 0px;
/* Creating the arrow using borders */
border: 4px solid transparent;
border-left: 4px solid #333;
}
ul li:hover>a::after {
border-left: 4px solid #f900b0;
}
HTML code
<ul class="ca-menu">
<li>
<a href="pagehome.php">
<span class="ca-icon">D</span>
<div class="ca-content">
<h2 class="ca-main">Halaman Utama</h2>
</div>
</a>
</li>
<li>
<a href="addpage.php">
<span class="ca-icon">F</span>
<div class="ca-content">
<h2 class="ca-main">Borang Baru</h2>
</div>
</a>
</li>
<li>
<a href="searchpage.php">
<span class="ca-icon">L</span>
<div class="ca-content">
<h2 class="ca-main">Carian Borang</h2>
</div>
</a>
</li>
<li class='has-sub'>
<a href="settingpage.php">
<span class="ca-icon">S</span>
<div class="ca-content">
<h2 class="ca-main">Tetapan</h2>
</div>
</a>
<ul>
<li>
<a href="settingpage.php">
<span class="ca-icon">S</span>
<div class="ca-content">
<h2 class="ca-main">Tetapan</h2>
</div>
</a>
</li>
</ul>
</li>
<li>
<a href="out.php" onClick="return confirm('Anda pasti untuk keluar dari sistem ?');">
<span class="ca-icon">X</span>
<div class="ca-content">
<h2 class="ca-main">Keluar</h2>
</div>
</a>
</li>
</ul>