.main-menu{
width:200px;
list-style:none;
padding:0;
margin:0;
background:#2980b9;
}
.sub-menu {
width: 200px;
list-style:none;
padding:0;
position: absolute;
left: 180px;
top: 0px;
z-index:1;
}
.main-menu a {
display: block;
padding: 10px 15px;
text-decoration: none;
color:#ffffff;
}
.main-menu > li > a{
border-bottom: 2px solid #2c3e50;
}
.opened a {
background:#1abc9c;
}
.opened .sub-menu li {
border-bottom: 2px solid #2ecc71;
}
.main-menu > li {
position: relative;
}