.flex-images {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
}
.flex-images > * {
    display: inline-block;
    position: relative;
}
.flex-images .flex-image-item {
    width: 50%;

}
.flex-images img {
    height: 100%;
    object-fit: cover;
    width: 100%;
}

.flex-images .inactive-img {
    display: none;
}

.flex-images > :not(.inactive-img):last-child,
.flex-images > .last-image {
    position: relative;
    /* background: #ccc; */
}
.flex-images .flex-image-show-plus {
    /* content: '+'; */
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: 5;
    background: #00000080;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 43px;
}

@media (min-width: 992px) {
    .flex-images .flex-image-item {
        width: 33.33%;
        
    }
}

@media (min-width: 1200px) {
    .flex-images .flex-image-item {
        width: 25%;
        
    }
}