Hey there! I've been trying to make this https://codepen.io/junedc/pen/yqXVaR responsive, but I'm having trouble. When I remove the height or change it to a percentage, the image disappears.
<div class="gallery-height">
<div class="img" style="height:125px; "></div>
<div class="img" style="height:400px;background-image: url('http://13.210.222.166/wp-content/uploads/2018/07/office1.jpg');"></div>
<div class="img" style="height:130px;"></div>
<div class="img" style="height:300px;background-image: url('http://13.210.222.166/wp-content/uploads/2018/07/office2.jpg');"></div>
<div class="img" style="height:300px;background-image: url('http://13.210.222.166/wp-content/uploads/2018/07/office3.jpg');"></div>