.all{
width:100%;
}
.PDF{
    width: 200px;
    display: inline-table;}
.hover{
	background-size:100%;	
	cursor:pointer;
}
.hover > img {
border:solid 1px black;
margin-left:auto;
margin-right:auto;
display:block;
}
.hover > h3 {
padding-top:10px;
text-align:center;
}
.hover > .description {
text-align:center;
}

@media screen and (max-width:900px){
	.PDF{
		width:50% !important;
		padding-bottom:25px;
	}
}

@media screen and (max-width:600px){
	.PDF{
		width:100% !important;
		padding-bottom:25px;
	}
}