Last-Child inside div not working - html

Question

I and using addthis share plugin and have changed background color to yellow and also added bottom-border: of 1px, I want to remove the bottom border from the last a which is not working for me using following css
css
div#at4-share a:last-child
{
border-bottom: 0px solid #1f1f1f;
}
HTML
<div id="at4-share" class="addthis_32x32_style atss atss-left addthis-animated slideInLeft at4-show">
<a class="at4-share-btn at-svc-facebook" href="#">
<span class=" at4-icon aticon-facebook" title="Facebook">Facebook</span>
</a>
<a class="at4-share-btn at-svc-twitter" href="#">
<span class=" at4-icon aticon-twitter" title="Twitter">Twitter</span>
</a>
<a class="at4-share-btn at-svc-pinterest_share" href="#">
<span class=" at4-icon aticon-pinterest_share" title="Pinterest">Pinterest</span>
</a>
<a class="at4-share-btn at-svc-google_plusone_share" href="#">
<span class=" at4-icon aticon-google_plusone_share" title="Google+">Google+</span>
</a>
<a class="at4-share-btn at-svc-compact" href="#">
<span class=" at4-icon aticon-compact" title="More">More</span>
</a>
<div id="at4-scc" class="at-share-close-control ats-transparent at4-show at4-hide-content" title="Hide">
<div class="at4-arrow at-left">Hide</div>
</div>
</div>
I had tried
div#at4-share a:last-of-type
{
border-bottom: 0px solid #1f1f1f;
}
so i am not sure what is wrong

Answer 1

You need to use :last-of-type, because :last-child is div with text hide in this case.
div#at4-share a:last-of-type {border-bottom: 2px solid red;}
https://jsfiddle.net/4y9j0z9q/
See the :last-child too
https://jsfiddle.net/4y9j0z9q/1/

Answer 2

The correct selector is :last-of-type.
div#at4-share > a:last-of-type
{
border-bottom:none; /* To remove the bottom border. */
}
FIDDLE