body,html{height:100%;margin:0 auto;padding:0;border:0}.split{display:flex;flex-direction:row}.gutter{background-color:#eee;background-repeat:no-repeat;background-position:50%}.gutter.gutter-horizontal{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==);cursor:col-resize}#flex{display:flex;flex-direction:row;height:100%}