zoominout.css

body{
    padding: 1rem;
}
.gallery{
    display: grid;
    list-style-type: none;
    padding: 0;
    margin: 0;
    grid-gap: 1rem;
    grid-template-columns: repeat(auto-fit,minmax(300px,1fr));
    grid-auto-rows: 300px;
    grid-auto-flow: dense;
}
.wide{
    grid-column: span 2;
}
.tall{
    grid-row: span 2;
}
img{
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

/* Zoom in out effect */
.gallery li{
    overflow: hidden;
}
.gallery img{
    transform: scale(1);
    transition: transform .3s ease-in-out;
}

.gallery img:hover{
    transform: scale(1.2);
}