.clearfix:before, .clearfix:after, .container:before, .container:after, .container-fluid:before, .container-fluid:after, .row:before, .row:after, .form-horizontal .form-group:before, .form-horizontal .form-group:after, .btn-toolbar:before, .btn-toolbar:after, .btn-group-vertical > .btn-group:before, .btn-group-vertical > .btn-group:after, .nav:before, .nav:after, .navbar:before, .navbar:after, .navbar-header:before, .navbar-header:after, .navbar-collapse:before, .navbar-collapse:after, .pager:before, .pager:after, .panel-body:before, .panel-body:after, .modal-footer:before, .modal-footer:after {
content : " ";
display : table;
}
.clearfix:after, .container:after, .container-fluid:after, .row:after, .form-horizontal .form-group:after, .btn-toolbar:after, .btn-group-vertical > .btn-group:after, .nav:after, .navbar:after, .navbar-header:after, .navbar-collapse:after, .pager:after, .panel-body:after, .modal-footer:after {
clear : both;
}
.center-block {
display : block;
margin-left : auto;
margin-right : auto;
}
.pull-right {
float : right !important ;
}
.pull-left {
float : left !important ;
}
.hide {
display : none !important ;
}
.show {
display : block !important ;
}
.invisible {
visibility : hidden;
}
.text-hide {
color : transparent;
text-shadow : none;
background-color : transparent;
border : 0;
}
.hidden {
display : none !important ;
visibility : hidden !important ;
} 
@media (max-width:650px) {
.hidden-xs {
display : none !important ;
}
}  
 
@media (min-width:651px) {
.hidden-lg {
display : none !important ;
}
}