Blank slide in Bootstrap 3 between every image slide - php

Question

I've used Bootstrap carousel in my webpage but there is a problem in the slides. The first image slides with content, second is blank, then third image slides, then third image there is blank page slide.
My code:
<div id="myCarousel" class="carousel slide">
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" ></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2" class="active"></li>
</ol>
<div class="carousel-inner">
<div class="item">
<img src="/site/img/daa.jpg" >
</div>
<div class="item">
<img src="/site/img/2.jpg" >
</div>
<div class="item active">
<img src="/site/img/grad.jpg" >
</div>
</div>
<a class="left carousel-control" href="#myCarousel" data-slide="prev">‹</a>
<a class="right carousel-control" href="#myCarousel" data-slide="next">›</a>
</div>
No margins, no padding, no .left or .right , and finally no spaces in the code..
What could the problem be?

Answer 1

Your code has some issues im edited your code Look at new updated and now you can understand Bootstrap Carousel Plugin
The Carousel plugin is a component for cycling through elements, like a carousel (slideshow).
Learn more about it W3SCHOOL
<div id="myCarousel" class="carousel slide" data-ride="carousel">
<!-- Indicators -->
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner" role="listbox">
<div class="item active">
<img class="first-slide" src="http://s32.postimg.org/osirordf9/2_black_wallpaper_pattern_preview.jpg" alt="First slide">
<div class="container">
</div>
</div>
<div class="item">
<img class="second-slide" src="http://s32.postimg.org/osirordf9/2_black_wallpaper_pattern_preview.jpg" alt="Second slide">
<div class="container">
</div>
</div>
<div class="item">
<img class="third-slide" src="http://s32.postimg.org/osirordf9/2_black_wallpaper_pattern_preview.jpg" alt="Third slide">
<div class="container">
</div>
</div>
</div>
<a class="left carousel-control" href="#myCarousel" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="right carousel-control" href="#myCarousel" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class

Answer 2

Thanks for your interest. I've used fiddle and tested my carousel, it worked fine there,
so after more effort, I detected the problem. It was because I have css file with
.next,.prev{
display: none !important;
}
but I don't understand deeply why it causes blank slide, not only white sides in my slides!
thanks again