.popup.block{
    visibility: visible;
    width: 100vw;
    height: 100vh;
    opacity: 1;
    filter: blur(0);
}
.popup{
    position: fixed;
    width: 0;
    height: 0;
    top:50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 100;
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    filter: blur(2px);
    transition: all .3s ease-out;
}
.popup .close{
    position: absolute;
    content: "close";
    color: #fff;
    top:20px;
    left: 20px;
    z-index: 1;
    font-size: 1.7rem;
    cursor: pointer;
}
.popup .back,
.popup .next{
    color: #fff;
    position: absolute;
    bottom: 50%;
    font-size: 1.3rem;
    transform: translateY(50%);
    cursor: pointer;
    height: 400px;
    width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.popup .back{
    left: 50px;
}
.popup .next{
    right: 50px;
}
.popup img{
    width: 0;
    height: 0;
    opacity: 0;
    max-width: 1450px;
    margin: 0 auto;
    transition: all .3s ease-out;
}
.popup.block img{
    height:100vh;
    width: auto;
    opacity: 1;
}

@media screen and (max-width: 1025px) {
    .popup img{
        transition: margin-bottom 0s ease-out;
    }
    .popup.block img {
        height: AUTO;
        width: 100%;
        opacity: 1;
    } 
    .popup .back{
        left: 50px;
    }
    .popup .next{
        right: 50px;
    }
}
@media screen and (max-width: 725px) {
    .popup .close{
        top:70px;
    }
    .popup .back,
    .popup .next{
        display: none;
}
}