.instagram-gallery-medium {
    cursor: pointer;
    display: -webkit-flex;
    display: -moz-flex;
    display: -ms-flex;
    display: -o-flex;
    display: flex;
    flex-wrap: wrap;
}
.instagram-gallery-medium > a{
    width: 100%;
    display: none;
}
.instagram-gallery-medium > a:nth-child(1){
    width: 100%;
    display: block;
    background-size: auto 100%;
    margin-bottom: 30px;
}
.instagram-gallery-medium > a > video, .instagram-gallery-medium > a > img{
    width: 100%;
    height: 100%;
    object-fit: cover;
  	 max-height: 400px;
    object-position: center;
}

@media (max-width: 1000px) {
   .instagram-gallery-medium > a > video, .instagram-gallery-medium > a > img{
     max-height: 350px;
  }
}

@media (max-width: 768px) {
    .instagram-gallery-medium > a:nth-child(1){
        width: 100%;
        display: block;
        background-size: auto 100%;
        margin-bottom: 30px;
    }
}
@media (max-width: 480px) {
    .instagram-gallery-medium > a:nth-child(1){
        width: 100%;
        display: block;
        background-size: auto 100%;
        margin-bottom: 30px;
    }
     .instagram-gallery-medium > a > video, .instagram-gallery-medium > a > img{
     	max-height: 420px;
   }
}