sidebar.css

/* CSS for the sidebar */

#sidebar {
    position: fixed;
    display: table;
    top: 0;
    left: 0;
    padding-right: 40px;
    height: 100%;
}

#sidebar > div {
    background-color: rgba(38, 50, 56, 0);
    height: 100%;

    -webkit-transition: background-color 0.3s;
    transition: background-color 0.3s;
    -webkit-transition-timing-function: ease-in-out;
    transition-timing-function: ease-in-out;
}

#sidebar:hover > div {
    background-color: rgba(38, 50, 56, 1);
}

#sidebar a {
    display: block;
    width: 200px;
    font-family: 'Lato', sans-serif;
    font-weight: 400;
    font-size: 18px;
    color: #E0E0E0;
    text-shadow: 0 1px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    padding: 6px 10px;
    padding-right: 15px;
    margin-left: -225px;

    -webkit-transition: margin-left 0.25s;
    transition: margin-left 0.25s;
    -webkit-transition-timing-function: ease-in-out;
    transition-timing-function: ease-in-out;
}
#sidebar:hover a {
    margin-left: 0px;
}

#sidebar a:first-child,#sidebar a.highlighted {
    border-right: solid 3px #66d9ef;
    background-color: rgba(255, 255, 255, 0.1);
}
#sidebar a:hover {
    background-color: rgba(255, 255, 255, 0.05);
}