tympanus net grid image hover
<div class="grid">
<div class="grid__item pos-1">
<div class="grid__item-img" style="background-image:url(img/1.jpg);"></div>
</div>
<div class="grid__item pos-2">
<div class="grid__item-img" style="background-image:url(img/2.jpg);"></div>
</div>
<div class="grid__item pos-3">
<div class="grid__item-img" style="background-image:url(img/3.jpg);"></div>
</div>
...
</div>