Custom hover state

#portfolio-grid .post .icon.plus,
#portfolio-grid .post:hover .icon.plus,
#portfolio-grid .post.ajax-expanded .icon.plus {
    display: block;
    width: 100px;
    height: 80px;
    position: absolute;
    margin: 0;
    background: transparent url(http://31.media.tumblr.com/1b2db8ecc7893eacd293312f23183c54/tumblr_mwxj9y9rC61sot984o1_100.png) no-repeat;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

#portfolio-grid .post .icon.plus::after,
#portfolio-grid .post:hover .icon.plus::after,
#portfolio-grid .post.ajax-expanded .icon.plus::after {
    display: none;
}