.offerBtn {
    transition: all .3s;
}

.offerBtn:hover {
    opacity: 0.8;
}

.offerMiddle {
    width: 84%;
    left: 8%;
    bottom: 5%;
    -webkit-mask: url("../images/btn_01.png") no-repeat center center;
    mask: url("../images/btn_01.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer01 {
    width: 78%;
    left: 11%;
    bottom: 14%;
    -webkit-mask: url("../images/btn_01.png") no-repeat center center;
    mask: url("../images/btn_01.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer02 {
    width: 84%;
    left: 8%;
    bottom: 11%;
    -webkit-mask: url("../images/btn_02.png") no-repeat center center;
    mask: url("../images/btn_02.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer03 {
    width: 84%;
    left: 8%;
    bottom: 11.5%;
    -webkit-mask: url("../images/btn_02.png") no-repeat center center;
    mask: url("../images/btn_02.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer04 {
    width: 84%;
    left: 8%;
    bottom: 14.5%;
    -webkit-mask: url("../images/btn_02.png") no-repeat center center;
    mask: url("../images/btn_02.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}