Edit in JSFiddle

@import url('demo.css');
 @import url('font-awesome.css');

/* GLOBALS */
 *, *:after, *:before {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
::selection {
    background: transparent;
}
::-moz-selection {
    background: transparent;
}
.wrapper-demo {
    margin: 60px 0 0 0;
    *zoom: 1;
    font-weight: 400;
}
.wrapper-demo:after {
    clear: both;
    content:"";
    display: table;
}
.wrapper-dropdown-2 {
    /* Size and position */
    position: relative;
    /* Enable absolute positionning for children and pseudo elements */
    width: 200px;
    margin: 0 auto;
    padding: 10px 15px;
    /* Styles */
    background: #fff;
    border-left: 5px solid grey;
    cursor: pointer;
    outline: none;
}
.wrapper-dropdown-2:after {
    content:"";
    width: 0;
    height: 0;
    position: absolute;
    right: 16px;
    top: 50%;
    margin-top: -3px;
    border-width: 6px 6px 0 6px;
    border-style: solid;
    border-color: grey transparent;
}
.wrapper-dropdown-2 .dropdown {
    /* Size & position */
    position: absolute;
    top: 100%;
    left: -5px;
    right: 0px;
    /* Styles */
    background: white;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
    list-style: none;
    /* Hiding */
    opacity: 0;
    pointer-events: none;
}
.wrapper-dropdown-2 .dropdown li a {
    display: block;
    text-decoration: none;
    color: #333;
    border-left: 5px solid;
    padding: 10px;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}
.wrapper-dropdown-2 .dropdown li:nth-child(1) a {
    border-left-color: #00ACED;
}
.wrapper-dropdown-2 .dropdown li:nth-child(2) a {
    border-left-color: #4183C4;
}
.wrapper-dropdown-2 .dropdown li:nth-child(3) a {
    border-left-color: #3B5998;
}
.wrapper-dropdown-2 .dropdown li i {
    margin-right: 5px;
    color: inherit;
    vertical-align: middle;
}
/* Hover state */
 .wrapper-dropdown-2 .dropdown li:hover a {
    color: grey;
}
/* Active state */
 .wrapper-dropdown-2.active:after {
    border-width: 0 6px 6px 6px;
}
.wrapper-dropdown-2.active .dropdown {
    opacity: 1;
    pointer-events: auto;
}
/* No CSS3 support */
 .no-opacity .wrapper-dropdown-2 .dropdown, .no-pointerevents .wrapper-dropdown-2 .dropdown {
    display: none;
    opacity: 1;
    /* If opacity support but no pointer-events support */
    pointer-events: auto;
    /* If pointer-events support but no pointer-events support */
}
.no-opacity .wrapper-dropdown-2.active .dropdown, .no-pointerevents .wrapper-dropdown-2.active .dropdown {
    display: block;
}