.menu_link {
    font-family: PFDin, sans-serif;
    font-size: 24px;
    padding: 28px 10px 28px 10px;
}

a.menu_link:link {
    text-decoration: none;
    color: #ecf0f1;

    background-color: none;
    -webkit-transition: background-color 100ms linear;
    -moz-transition: background-color 100ms linear;
    -o-transition: background-color 100ms linear;
    -ms-transition: background-color 100ms linear;
    transition: background-color 100ms linear;
}

a.menu_link:hover {
    text-decoration: none;
    color: #ecf0f1;

    background-color: #1abc9c;
    -webkit-transition: background-color 200ms linear;
    -moz-transition: background-color 200ms linear;
    -o-transition: background-color 200ms linear;
    -ms-transition: background-color 200ms linear;
    transition: background-color 200ms linear;
}