Removing that annoying white background from thumbnails in Bootstrap 3 - css

Question

I have created small piece of code where it shows 4 thumbnails in a row of equal grid width.
.row-content-3 {
background-color: rgba(0,0,0,0.8) !important;
color: #fff;
margin:0px auto;
padding: 50px 0px 50px 0px;
min-height:200px;
}
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<div class="row row-content-3">
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair1.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair2.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair3.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair4.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
</div>
If you run the code,you will notice that there is a white background which needs to be removed. I put this css simple code,but it didn't work:(.
.thumbnail {
border: 0;
}
Also I am giving you the jsfiddle.
Any ideas,
Thanks Theo.

Answer 1

If i am not wrong then you wanted to remove the white background from the circle image back only.
I Added this
.thumbnail {
border: 0;
background: transparent;
}
And you can see there is box shadow too. You can remove that by using
box-shadow: none;
Updated fiddle: https://jsfiddle.net/udgw71no/6/

Answer 2

Give background color as transparent for thumbnail class
.thumbnail {
border: 0;
background-color:transparent;
}
Updated fiddle : https://jsfiddle.net/affaz/udgw71no/8/

Answer 3

Looking for this ?
.thumbnail {
border: 0;
background: transparent;
-webkit-box-shadow: none;
box-shadow: none;
}
Demo

Answer 4

remove background of thumbnail but to make it working.
.row-content-3 {
background-color: rgba(0,0,0,0.8) !important;
color: #fff;
margin:0px auto;
padding: 50px 0px 50px 0px;
min-height:200px;
}
.thumbnail {
background: none !important;
border: 0 !important;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<div class="row row-content-3">
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair1.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair2.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair3.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
<div class="col-xs-12 col-sm-3 col-md-3 col-lg-3">
<div class="thumbnail">
<a href="#">
<img src="http://www.theo-android.co.uk/github-images/fair4.png" class="img-circle" alt="Larissa's fair">
</a>
</div>
</div>
</div>

Answer 5

Setting the following styles should do it:
.thumbnail {
background-color: transparent;
border: none;
}