.colunasgal {
  float: left;
  width: 33,33%;
  padding: 5px;
}
    /* duas colonas */
   @media screen and (max-width: 600px) {
   .colunasgal {
    width: 100%;
  }
   }

.screenshots a {
	float:left;
	margin:10px 0 15px 10px;
	width: 100px;
    height: 75px;
	border:2px solid #e9e9e9;	
	overflow:hidden;
}
.screenshots a:hover {
	color:#333;
	-moz-box-shadow: 0 0 7px #999;
	-webkit-box-shadow: 0 0 7px #999;
	box-shadow: 0 0 7px #999;
}
.img-horizontal { 
	margin:0px 0 5px;
	width:300px;
	height:200px;
}
.img-ini { 
	margin:0px 0 5px;
	width:60px;
	height:60px;
}
.img-vertical { 
	margin:-90px 0 5px;
}