Grigory S.

@import (reference) '../lib/bootstrap/less/bootstrap.less';
@import "../lib/bootstrap/less/mixins/buttons.less";

.btn-dark {
   .button-variant(#fff, #e36d00, #737373);
}

if (file_exist('/media/k2/items/cache/'.md5("Image".$item->id).'_S.jpg')) {
    echo '<div class="img" style="background-image: url(....)">';
} else {
    echo '<h1>Title</h1>'
}

if(!$('.image_middle').is(':visible')){

}