.instagram-login {
    background-image: url("../images/sign_in_instagram.png");
    display: inline-block;
    width: 160px;
    height: 60px;
}
.gallery-item {
    float:left;
    position: relative;
    padding: 0 10px 6px 0;
    margin: 0px;
}
.gallery-cb {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
}
.gallery-cb + img {
    opacity: 0.6
}
.gallery-cb:checked + img  {
    opacity: 1
}