.block-pdf-resources .pdfs {display:flex; flex-wrap:wrap; margin:-25px;}
.block-pdf-resources .pdfs .pdf {margin:25px; flex:0 0 calc(25% - 50px); background:var(--color-blue); text-decoration:none;}
.block-pdf-resources .pdfs .pdf .thumbnail {position:relative; padding-bottom:56%;}
.block-pdf-resources .pdfs .pdf .thumbnail img {position:absolute; top:0; left:0; width:100%; height:100%; object-fit:cover;}
.block-pdf-resources .pdfs .pdf .title {background:var(--color-blue); color:#fff; padding:15px; text-align:center; text-transform:uppercase;}

@media (max-width:810px) {
	.block-pdf-resources .pdfs .pdf {flex-basis:calc(33.33% - 50px);}
}

@media (max-width:700px) {
	.block-pdf-resources .pdfs .pdf {flex-basis:calc(50% - 50px);}
}