Overflow hidden with border-radius still shows small border

Question

I was trying to create a text overlay on top of an image, and I wanted to add a slight border-radius to it all. But I noticed that when adding border-radius: 5px and overflow: hidden to the parent, the image behind the overlay is still showing a small part of its border on the bottom corners, as if it forgot to hide a pixelated line there.

(small grey line in bottom right corner from image still visible)

.main-info {
  box-shadow: 0px 0px 3px 2px #221b25c7;
  border-radius: 5px;
  font-size: 0.75rem;
  overflow: hidden;
}

.main-info > .img {
  position: relative;
}

.text {
  position: absolute;
  display: flex;
  width: 100%;
  bottom: 0;
  -webkit-box-align: center;
  align-items: center;
  -webkit-box-pack: justify;
  justify-content: space-between;
  -webkit-transition: opacity 0.2s ease-out;
  transition: opacity 0.2s ease-out;
  opacity: 1;
  color: white;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(3px);
  z-index: 5;
  line-height: 25px;
}

.text > .limit {
  color: white;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  position: relative;
  max-width: 100%;
  width: 0;
  padding: 0 0.5rem;
}

.text > .limit {
  text-align: center;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<div class="row m-5">
  <div class="col-8">
    <div class="main-info">
      <div class="img">
        <a href="#">
          <div class="text">
            <div class="limit">Hello World</div>
          </div>
          <img src="https://placehold.it/272x154" style="width: 100%">
        </a>
      </div>
    </div>
  </div>
</div>

I've thought of just adding the border-radius to the children, but that gave the same result.

Answer 1

I've actually found this gist yesterday, which seems like a miracle fix for the border issue on the overflow item:

-webkit-mask-image: -webkit-radial-gradient(white, black);