.icon.home {
    background-image: url(../images/nav/home-white.png);
}
.icon.home.active {
    background-image: url(../images/nav/home-black.png);
}
.icon.about {
    background-image: url(../images/nav/about-white.png);
}
.icon.about.active {
    background-image: url(../images/nav/about-black.png);
}
.icon.publications {
    background-image: url(../images/nav/publications-white.png);
}
.icon.publications.active {
    background-image: url(../images/nav/publications-black.png);
}
.icon.memberships {
    background-image: url(../images/nav/memberships-white.png);
}
.icon.memberships.active {
    background-image: url(../images/nav/memberships-black.png);
}
.icon.events {
    background-image: url(../images/nav/events-white.png);
}
.icon.events.active {
    background-image: url(../images/nav/events-black.png);
}
.icon.awards {
    background-image: url(../images/nav/awards-white.png);
}
.icon.awards.active {
    background-image: url(../images/nav/awards-black.png);
}
.icon.board {
    background-image: url(../images/nav/board-white.png);
}
.icon.board.active {
    background-image: url(../images/nav/board-black.png);
}
.icon.authors {
    background-image: url(../images/nav/authors-white.png);
}
.icon.authors.active {
    background-image: url(../images/nav/authors-black.png);
}
.icon.downloads {
    background-image: url(../images/nav/downloads-white.png);
}
.icon.downloads.active {
    background-image: url(../images/nav/authors-black.png);
}
.icon.contact {
    background-image: url(../images/nav/contact-white.png);
}
.icon.contact.active {
    background-image: url(../images/nav/authors-black.png);
}
.icon.chevron-down {
    background-image: url(../images/chevron-down.png)
}
.icon.university {
    background-image: url(../images/nav/university.png)
}
.icon.email {
    background-image: url(../images/nav/email.png)
}
.icon.share-white {
    background-image: url(../images/share-white.png)
}