.container_gallery{
  	width: 1200px;
  	margin: 50px auto;
  	overflow: hidden;
  	text-align: center;
  }

 .gallery_box{
 overflow: hidden;
 margin: 0px 1.2%;
text-align: center;

 }

 .gallery_box img{
 	max-width: 100%;
 }

    .gallery_box .c {
		float: left;
    width: 290px;
    height: auto;
    text-align: center;
    border: 1px solid green;
     min-height: 300px;
      max-height: 300px;
	
    }

    .gallery_box .c.helper img{
    max-width: 52%;
    margin-top: 25px;
    }

    

    .gallery_box .c a {
      text-decoration: none;
    }

    .back{
      width: 400px;
height: 45px;
color: #FFF;
background: #F00 none repeat scroll 0% 0%;
border-radius: 15px;
text-align: center;
line-height: 45px;
margin: 20px auto;
font-size: 1.2em;
display: block;
text-decoration: none;
position: fixed;
right: -50px;
top: 200px;
 transform: rotate(90deg);
  -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    -sand-transform: rotate(90deg);
    }

    .back a {
      text-decoration: none;
      color: #fff;
      text-transform: uppercase;
      font-size: 1em;

    }