Youtube video not playing over overlay photo

Why this code is working on the landing-3.html and not in my index.html page? You can check the page here www.blendmount.com/newsite/index.html at the bottom of the page:)

					<div class="col_one_third topmargin nobottommargin">

					<h3>Why BlendMount?</h3>

					<p>Top 10 reasons why you should consider BlendMount</p>

					<ul class="iconlist iconlist-large iconlist-color">
						<li><i class="icon-ok-sign"></i> Interactive Live Builder</li>
						<li><i class="icon-ok-sign"></i> Valid HTML5 & CSS3 Semantics</li>
						<li><i class="icon-ok-sign"></i> 100% Open Source & Customizable</li>
						<li><i class="icon-ok-sign"></i> Responsive & Retina Devices Support</li>
						<li><i class="icon-ok-sign"></i> Easy Embeddable Media & Graphics</li>
						<li><i class="icon-ok-sign"></i> Lifetime <strong>FREE</strong> Updates</li>
						<li><i class="icon-ok-sign"></i> 100% Open Source & Customizable</li>
						<li><i class="icon-ok-sign"></i> Responsive & Retina Devices Support</li>
						<li><i class="icon-ok-sign"></i> Easy Embeddable Media & Graphics</li>
						<li><i class="icon-ok-sign"></i> Lifetime <strong>FREE</strong> Updates</li>							
					</ul>

				</div>

				<div class="col_two_third topmargin nobottommargin col_last">

						<div class="landing-video">
						<iframe style="" src="https://www.youtube.com/embed/OG5i0W7tXjE" width="560" height="315" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
					</div>

				</div>

I've pasted the same code in the your landing-3.html demo page and it worked perfectly but when I insert the same code in my index.html it doesn't work... Do you know why?
Thanks
Sebastien

http://www.blendmount.com/newsite/landing-3.html ( working youtube Video)

http://www.blendmount.com/newsite/index.html