.crop-container{
  margin-bottom:20px;
  text-align:center;
}
.crop-container>div.menu{
  margin-top:5px;
  display:inline-block;
}
.crop-container>div.menu>div.btn-group{
  margin-bottom:5px;
}

div#thumb_container{
  width:100%;
  position:relative;
}
div#thumb_container div.thumb{
  width:20%;
  float:left;
  min-height:25px;
  position:relative;
  cursor:pointer;
}
div#thumb_container div.thumb>img{
  width:100%;
}

div.shader{
  position:absolute;
  top:0;left:0;right:0;bottom:0;
  background-color:rgba(0,0,0,0.9);
  border:0px solid green;
}
div.shader.error{
  border-color:red;
}
div.shader.opaque{
  background-color:transparent;
}
div.thumb.remove>div.remove-shader{
  top:0;
  bottom:0;
  left:0;
  right:0;
  position:absolute;
  background-color:rgba(255,0,0,0.6);
}
div.thumb>span.remove{
  display:none;
  position:absolute;
  top:0;
  right:0;
  width:24px;
  line-height:100%;
  padding:5px;
  font-size:14px;
  font-weight:bold;
  text-align:center;
  background-color:rgba(0,0,0,0.8);
  color:white;
  cursor:pointer;
}
div.thumb:hover>span.remove{
  display:block;
}