.qrcode-bg {
    background-image: url(../images/bg1.jpg);
    background-size: cover;
    background-position: right top;
    animation: bgchange 20s linear infinite;
    -webkit-animation: bgchange 20s linear infinite;
}

@keyframes bgchange {
    0%{
        background-image: url(../images/bg1.jpg);
    }
    33% {
        background-image: url(../images/bg2.jpg);
    }
    67% {
        background-image: url(../images/bg3.jpg);
    }
    100% {
        background-image: url(../images/bg4.jpg);
    }
}

@-webkit-keyframes bgchange {
    0% {
        background-image: url(../images/bg1.jpg);
    }

    33% {
        background-image: url(../images/bg2.jpg);
    }

    67% {
        background-image: url(../images/bg3.jpg);
    }

    100% {
        background-image: url(../images/bg4.jpg);
    }
}


.image-list {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

    .image-list a {
        display: block;
        margin: 1rem;
        margin-bottom: 0;
        width: 26%;
        border-radius: 25px;
        box-shadow: rgba(0, 0, 0, 0.25) 0px 54px 55px, rgba(0, 0, 0, 0.12) 0px -12px 30px, rgba(0, 0, 0, 0.12) 0px 4px 6px, rgba(0, 0, 0, 0.17) 0px 12px 13px, rgba(0, 0, 0, 0.09) 0px -3px 5px;
    }

    .image-list img {
        width: 100%;
        height: auto;
        border-radius: 25px;
    }

@media (max-width: 576px) {
    .image-list a {
        width: 75%;
    }
}