ul.ppt {
	position: relative;
	text-align:center;
	
}

.ppt li {
	list-style-type: none;
	position: absolute;
	text-align:center;
	top: -115px;
	left: -11px;
	width: 364px;
	height: 299px;
}

.ppt img {
	border: 1px solid #e7e7e7;
	padding: 5px;
	background-color: #ececec;

	
}




</style>