.disk {
    background-image: url(../images/icons/disk.png) ! important;
}

.tick {
    background-image: url(../images/icons/tick.png) ! important;
}

.cross {
    background-image: url(../images/icons/cross.png) ! important;
}

.plus-circle {
    background-image: url(../images/icons/plus-circle.png) ! important;
}

.minus-circle {
    background-image: url(../images/icons/minus-circle.png) ! important;
}