.gallery{

    display:flex;
    flex-wrap:wrap;
    row-gap: 48px;   
    column-gap: 24px;
    list-style-type: none;
    padding: 16px 8px;
}

.gallery li {
  flex: 0 0 calc((100% - 2 * 24px) / 3);
  box-sizing: border-box;
}

.gallery img {
  width: 100%;
  height: 100%;     
  object-fit: cover;  
  display: block;
}