gentelella/vendors/iCheck/skins/futurico/futurico.css

/* iCheck plugin Futurico skin
----------------------------------- */
.icheckbox_futurico,
.iradio_futurico {
    display: inline-block;
    *display: inline;
    vertical-align: middle;
    margin: 0;
    padding: 0;
    width: 16px;
    height: 17px;
    background: url(futurico.png) no-repeat;
    border: none;
    cursor: pointer;
}

.icheckbox_futurico {
    background-position: 0 0;
}
    .icheckbox_futurico.checked {
        background-position: -18px 0;
    }
    .icheckbox_futurico.disabled {
        background-position: -36px 0;
        cursor: default;
    }
    .icheckbox_futurico.checked.disabled {
        background-position: -54px 0;
    }

.iradio_futurico {
    background-position: -72px 0;
}
    .iradio_futurico.checked {
        background-position: -90px 0;
    }
    .iradio_futurico.disabled {
        background-position: -108px 0;
        cursor: default;
    }
    .iradio_futurico.checked.disabled {
        background-position: -126px 0;
    }

/* HiDPI support */
@media (-o-min-device-pixel-ratio: 5/4), (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi) {
    .icheckbox_futurico,
    .iradio_futurico {
        background-image: url(futurico@2x.png);
        -webkit-background-size: 144px 19px;
        background-size: 144px 19px;
    }
}