Thumbnail Hovers

I just was looking at the live demo site running for this theme here:

https://www.andersnoren.se/themes/fukasawa/

But my install isn’t working the same on the thumbnail hovers. What is different I noticed is on the index/home page when I hover over the featured image it says “View” with an arrow on the demo site. But on my site it isn’t working that way for some reason.Does anyone have the same issue?

Following I believe is the code for it, and it is in my Theme install of the CSS file, but not working for some reason:

.post-overlay .view {
display: block;
width: 100%;
font-size: 0.75em;
font-weight: 700;
text-transform: uppercase;
letter-spacing: 2px;
color: #fff;
text-align: center;
position: absolute;
top: 50%;
margin-top: -6px;
}

Any help would be much appreciated.