.offerBtn {
    transition: all .3s;
}

.offerBtn:hover {
    opacity: 0.8;
}

.offer01 {
    width: 94.9%;
    left: 2%;
    bottom: 12.5%;
}

.offer02 {
    width: 94.9%;
    left: 2%;
    bottom: 12.5%;
}

.offer03 {
    width: 94.9%;
    left: 2%;
    bottom: 12.5%;
}

.offer04 {
    width: 94.9%;
    left: 2%;
    bottom: 9.5%;
    -webkit-mask: url("../images/offer/btn_04.png") no-repeat center center;
    mask: url("../images/offer/btn_04.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer05 {
    width: 94.9%;
    left: 2%;
    bottom: 12.5%;
    -webkit-mask: url("../images/offer/btn_05.png") no-repeat center center;
    mask: url("../images/offer/btn_05.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}