.circulo{
				position: relative;
				background:rgba(0,0,0,0.6);
				border-radius: 50%;
				width: 50px;
				height: 50px;
				left: 5px;
				overflow: hidden;
				display: inline-block;
			}
			.imagen{
				box-sizing: border-box;
				width: 100%;
				height: auto;
				position:absolute;
			    left: -100%;
			    right: -100%;
			    top: -100%;
			    bottom: -100%;
			    margin: auto;
			    min-height: 100%;
			    min-width: 100%;
						
			}