.offerBtn {
    transition: all .3s;
}

.offerBtn:hover {
    opacity: 0.8;
}

.offer01 {
    width: 88%;
    left: 6%;
    bottom: 7%;
    filter: drop-shadow(0px 25px 20px rgb(234, 47, 0, 0.8));

}

@media (max-width:768px) {
    .offer01 {
        filter: drop-shadow(0px 15px 15px rgb(234, 47, 0, 0.8));
    }
}

.offer02 {
    width: 32.1%;
    left: 9%;
    bottom: 5%;
    -webkit-mask: url("../images/offerBtn02.png") no-repeat center center;
    mask: url("../images/offerBtn02.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer03 {
    width: 32.1%;
    right: 11%;
    bottom: 5%;
    -webkit-mask: url("../images/offerBtn02.png") no-repeat center center;
    mask: url("../images/offerBtn02.png") no-repeat center center;
    -webkit-mask-size: contain;
    mask-size: contain;
}

.offer04 {
    width: 88%;
    left: 6%;
    bottom: 4%;
    filter: drop-shadow(0px 25px 20px rgb(234, 47, 0, 0.8));
}

@media (max-width:768px) {
    .offer04 {
        filter: drop-shadow(0px 15px 15px rgb(234, 47, 0, 0.8));
    }
}