Border problems in chrome - css

Question

I'm having a problem with a fixed border around a responsively sized div. This issue only happens in Chrome.
I'm having a hard time reproducing it in JSFiddle, but I'm essentially trying to center a div within another (which is placed somewhere on my page) and the centered-div has a nice 1px border around it. The LESS for these two elements are as follows:
.popup {
display: inline-block;
height: 93%; width: 30%;
margin-right: 7%;
margin-left: -3%;
position: relative;
.text {
box-sizing: border-box;
width: 100%; height: 50%;
border: 1px solid black;
padding: 0 5%;
position: absolute;
top: 50%; left: 50%;
.translate(-50%, -50%); # Some LESS that is just a translate call
color: black;
font-size: 18px;
}
}
This is what I see, which changes as the screen size changes (sometimes correct, sometimes different borders are missing/incorrect):
EDIT: Added relevant HTML.
<div class="container">
...Other stuff...
<div class="content">
...Other stuff...
<div class="breakdown">
<div class="block">C++ (Circle dials you see)</div>
<div class="popup">
<div class="text">Some text here to go in the popup</div>
</div>
<div class="block">Java (Next dial)</div>
<div class="popup">
<div class="text">Some text here to go in the popup for the Java dial</div>
</div>
</div>
</div>
</div>
There's more stuff in container, and more stuff in content in the DOM levels shown. However, the other items in container are each in their own block on the page (no overlap), and so is the items in content. A breakdown div holds the dials and popups that you can see in the screenshots. The idea is that when i hover over a "block" or a dial the popup shows up to the right, shoving the next dial over when shown.

Answer 1

I've observed such issues with borders when I have zoomed the page - that would explain why you see it only in Chrome and only on one domain (you said you cannot reproduce it in JSFiddle).
Click Ctrl+0 or check if you have an icon in the addressbar of a magnifying glass (it's displayed when the zoom level is different from 100%).