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