.post_item p.img.thumb {
    position: relative;
    overflow: hidden;
}

.post_item p.img.thumb img {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    object-fit: cover;
    width: 100%;
    height: 100%;
    z-index: -999;
}
.post_item p.img.thumb:before {
    content: "";
    display: block;
    padding-top: 62.5%;
}

@media screen and (min-width: 768px) {
    .post_list_new li.post_item:nth-child(1) .img.thumb {
	margin-right: 2px;
    }
    .post_list_new li.post_item:nth-child(2) .img.thumb {
	margin-left: 2px;
    }
}