CSS - Why 3D Carousel is blurry?

I'm making a 3D Carousel. Here is my code : 3D Carousel.

#wrapper{
  width:420px;
  height:279px;
  position:relative;
  margin:40px auto 40px auto;
  -webkit-perspective: 800px;
  perspective: 800px;
}

.carrousel{
  position:absolute;
  width:100%;
  height:266px;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
  transition: all 1s;
}

.plan{
  position:absolute;
  height: 100%;
  width: 400px;
  text-align:center;
  line-height: 60px;
  font-size: 24px;
  color:#FFF;
  top:100px;
  left: 5px;
  opacity: 1

}

First you can see my carousel and then picture I would like to display.

I wonder why my pictures and my text are blurry ?

I have tried lots of CSS properties like backface-visibility or -webkit-font-smoothing in different class. But I have always the same issue, pictures and text are blurry.

Does anyone know a solution to display it correctly ?

Thank you very much !