1a imagem:
.ge-link { background-image: url(‘http://mol.icb.usp.br/wp-content/uploads/16-3.jpg’); background-repeat: no-repeat; background-size: contain;}
2a imagem
.ge-link:hover { background-image: url(‘http://mol.icb.usp.br/wp-content/uploads/16-3-MO.jpg’); background-repeat: no-repeat; background-size: contain;}
http://mol.icb.usp.br/wp-content/uploads/16-3.jpg