1px white line when using 2D transforms - html

Question

I have an image with a background image, and hovering on it will scale and rotate with CSS 2D transforms. Everything works fine, except a white gap line of 1px, which looks terrible. This doesn't happen just in Chrome, but almost all browsers. I've tried the following, but without success:
adding -webkit-backface-visibility: hidden to the image div and/or
its wrapper
adding -webkit-transform: translateZ(0) scale(1.0, 1.0) to the image div and/or its wrapper
trying different display values
trying different position values
I think this problem only persists when using overflow: hidden.
HTML:
<a href="#" class="article col-xs-4">
<div class="article-overlay"></div>
<div class="article-content">
<h2>Learn the skills to land your dream job</h2>
<h6>Education / Academy</h6>
</div>
<div class="article-image" style="background-image: url('assets/images/ed1.jpg')"></div>
</a>
CSS:
#main-content .education .article {
display: block;
height: 100%;
position: relative;
z-index: 1;
padding: 0;
text-decoration: none;
overflow: hidden;
}
#main-content .education .article .article-overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 2;
transition: all 0.5s;
background-color: rgba(0, 0, 0, 0.5);
}
#main-content .education .article:hover .article-overlay {
background-color: rgba(0, 0, 0, 0.35);
}
#main-content .education .article .article-image {
width: 100%;
height: 100%;
position: relative;
background-position: center;
-webkit-transform: scale(1) rotate(0deg);
transform: scale(1) rotate(0deg);
transition: all 0.5s;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
}
#main-content .education .article:hover .article-image {
-webkit-transform: scale(1.2) rotate(2deg);
transform: scale(1.2) rotate(2deg);
}
#main-content .education .article .article-content {
z-index: 3;
color: #fff;
position: relative;
text-align: center;
position: absolute;
width: 60%;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -100%);
transform: translate(-50%, -100%);
}
#main-content .education .article .article-content h2 {
text-transform: uppercase;
font-weight: 700;
font-size: 22px;
letter-spacing: 1px;
line-height: 40px;
position: relative;
padding-top: 20px;
margin: 0;
}
#main-content .education .article .article-content h2:before {
content: "";
display: block;
width: 150px;
height: 6px;
background-color: #bedb39;
position: absolute;
top: 0;
left: 50%;
margin-left: -75px;
}
#main-content .education .article .article-content h6 {
font-weight: normal;
text-transform: uppercase;
font-size: 16px;
position: relative;
padding-top: 20px;
margin: 0;
}
#main-content .education .article .article-content h6:before {
content: "";
display: block;
width: 150px;
height: 2px;
background-color: #fff;
position: absolute;
top: 0;
left: 50%;
margin-left: -75px;
}
Live demo:
http://amarsyla.com/sandbox/codo/education.html

Answer 1

ok, its becouse of z-index, clear z-index from #main-content .education .article and you can set z-index to .logo and .social-icons for example 20 for bringing to front.
#main-content .education .article {
display: block;
height: 100%;
position: relative;
padding: 0;
text-decoration: none;
overflow: hidden;
}
#header .logo, #header .social-icons {
z-index: 20;
}