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This CSS code will give you the cool ‘tucked corners’ effect that is used on the Gravatar home page.

div.tucked-corners {
	    background: #f6f6f6;
	    height: 380px;
	    margin: 50px auto;
	    padding: 10px;
	    position: relative;
	    width: 580px;
	    -webkit-box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
	       -moz-box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
	            box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
	}
	span.tucked-corners {
	    background: #c4453c;
	    display: block;
	    height: 380px;
	    position: relative;
	    width: 580px;
	    -webkit-box-shadow: inset 0 0 10px hsla(0,0%,0%,.25);
	       -moz-box-shadow: inset 0 0 10px hsla(0,0%,0%,.25);
	            box-shadow: inset 0 0 10px hsla(0,0%,0%,.25);
	}

	/* Top Corner Effect */

	.top-corners:after,
	.top-corners:before {
	    background: #e6e6e6;
	    content: '';
	    height: 50px;
	    position: absolute;
	    top: -25px;
	    width: 100px;
	    z-index: 10;
	    -webkit-box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	       -moz-box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	            box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	}
	.top-corners:after {
	    left: -50px;
	    -webkit-transform: rotate(-45deg);
	       -moz-transform: rotate(-45deg);
	        -ms-transform: rotate(-45deg);
	         -o-transform: rotate(-45deg);
	            transform: rotate(-45deg);
	}
	.top-corners:before {
	    right: -50px;
	    -webkit-transform: rotate(45deg);
	       -moz-transform: rotate(45deg);
	        -ms-transform: rotate(45deg);
	         -o-transform: rotate(45deg);
	            transform: rotate(45deg);
	}

	/* Bottom Corner Effect */

	.bottom-corners:after,
	.bottom-corners:before {
	    background: #e6e6e6;
	    content: '';
	    height: 50px;
	    position: absolute;
	    bottom: -25px;
	    width: 100px;
	    -webkit-box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	       -moz-box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	            box-shadow: 0 6px 9px -8px hsla(0,0%,0%,.5);
	}
	.bottom-corners:after {
	    left: -50px;
	    -webkit-transform: rotate(-135deg);
	       -moz-transform: rotate(-135deg);
	        -ms-transform: rotate(-135deg);
	         -o-transform: rotate(-135deg);
	            transform: rotate(-135deg);
	}
	.bottom-corners:before {
	    right: -50px;
	    -webkit-transform: rotate(135deg);
	       -moz-transform: rotate(135deg);
	        -ms-transform: rotate(135deg);
	         -o-transform: rotate(135deg);
	            transform: rotate(135deg);
	}