fastadmin/public/assets/libs/draggable/demos/boundedcustom/boundedcustom.css

.ball {
	margin: -50px 0 0 -50px;
	position: absolute;
		left: 50%;
		top: 50%;
	z-index: 1;
}

#drag-bound-indicator {
	background: #ddd;
	border-radius: 150px;
	height: 300px;
	margin: -150px 0 0 -150px;
	position: absolute;
		left: 50%;
		top: 50%;
	width: 300px;
	z-index: 0;
}