body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100vw;
    margin: 0;
}
.bg{
    position: absolute;
    z-index: -1;
    height: 100vh;
    width: 100vw;
    margin: 0;
    transition: all 0.5s;
    opacity: 0;
}
.Htmldiv{
    display: flex;
    justify-content: space-around;
    align-items:center;
    flex-wrap: wrap;
    width: 1000px;
    height: 800px;
    
}
.Htmldiv > img{
    transition: all  0.5s;
}