.post_container{
  --post-item-margin:5px;
    justify-content: center;
}

.post_container .card .card-img-top {
  object-fit: cover;
  aspect-ratio: 4 / 3;
  object-position: center center;
}


.post_container .card .card-body {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.post_container .post_item{
  width: calc(25% - var(--post-item-margin) * 2);
  margin: var(--post-item-margin);
}
/*
Bootstrap
Breakpoint	Class infix	Dimensions
Extra small	None	<576px
Small	sm	≥576px
Medium	md	≥768px
Large	lg	≥992px
Extra large	xl	≥1200px
Extra extra large	xxl	≥1400px
*/

@media screen and (max-width:576px) {
  .post_container {
    flex-wrap: wrap;
  }
  .post_container .post_item{
    width: calc(50% - var(--post-item-margin) * 2);
  }

  .post_container .post_item .card-text{
    display: none;
  }
}