side post navigation – Next page tab looking strange

Side post navigation – Next page tab looking strange, the images are no longer round?

In a previous ticket I was changing the size and colour of the tab however I thought I removed all the code.

Can anyone help get it back to looking like the original should?

https://www.dropbox.com/s/hm1ynoip43vpon2/Captures.PNG?dl=0

here is the Quick CSS code i have in the theme :

#top .fullsize .template-blog .post .entry-content-wrapper > * { max-width: 800px; }

#footer a {
color: black;
}
#footer a:hover {
color: blue;
}

.widget_recent_entries li a {
font-style: normal !important;
}

.image-overlay {
visibility: hidden;
}

div#commentform.fb-social-plugin {
margin-left: 17%;
}

@media only screen and (max-width: 767px) {
.container.template-blog {
width: 94%;
}}

span.blog-tags.minor-meta {
display: none;
}

.home .content { padding-bottom: 10px; }

span.av-masonry-date { display: none; }
.av-masonry-entry .av-inner-masonry-content { padding: 20px; }

@media only screen and (max-width: 767px) {
.responsive .tabcontainer .tab_titles {
display: block;
border-top: 1px solid #555555;
}
.responsive .top_tab .tab.fullsize-tab {
display: none;
}
.responsive #top .footer_color .tabcontainer .active_tab {
color: #444; }
}

@media only screen and (max-width: 480px) {
.av-inner-masonry-content.site-background {
background: rgba(255,255,255,0.5) !important;
}}

body .container_wrap .hr.avia-builder-el-first { margin: 10px 0; }
.av-special-heading { margin-top: 10px; }
.avia-content-slider { margin: 10px 0; }

@media only screen and (max-width: 479px) {
.responsive #top .related_entries_container .av_one_eighth {
margin-bottom: 3px;
}}

#scroll-top-link {
background-color: grey;
}

@media only screen and (max-width: 767px) {
ul.av-share-box-list {
margin-bottom: 80px;
}
}

h5.av-share-link-description {
text-align: center;
}

#top #wrap_all .av-social-link-facebook:hover a, #top #wrap_all .av-social-link-twitter:hover a, #top #wrap_all .av-social-link-gplus:hover a, #top #wrap_all .av-social-link-pinterest:hover a {
color: #888;
background-color: white;
}
#top #wrap_all .av-social-link-facebook a {
color: #fff;
background-color: #37589b;
}
#top #wrap_all .av-social-link-twitter a {
color: #fff;
background-color: #46d4fe;
}
#top #wrap_all .av-social-link-gplus a {
color: #fff;
background-color: #de5a49;
}
#top #wrap_all .av-social-link-pinterest a {
color: #fff;
background-color: #cb2027;
}

#top #wrap_all .av-social-link-mail a {
color: #fff;
background-color: #9fae37;
}
#top #wrap_all .av-social-link-linkedin a {
color: #fff;
background-color: #419cca;
}
#top #wrap_all .av-social-link-linkedin:hover a, #top #wrap_all .av-social-link-mail:hover a { color: #888;
background-color: white;
}

@media only screen and (min-width: 768px) {
.av-share-box { margin-bottom: 40px; }}