.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.rollover {
    display: block;!important;
    width: 200px;!important;
    height: 300px;!important;
    background: url(/fotos/_MG_8764.JPG) no-repeat;!important;
    -webkit-transition: all .7s ease-in-out;!important;
    -moz-transition: all .7s ease-in-out;!important;
    -o-transition: all .7s ease-in-out;!important;
    transition: all .7s ease-in-out;!important;
}

.rollover:hover {
    background: url(/fotos/_MG_8754.JPG)!important;

}

<style>
/* Instagram sectie – Lef Zutphen */
.rr-instagram {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 1rem;
}

.rr-instagram h2 {
    margin-bottom: 1.5rem;
}

.rr-instagram-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}
</style>