.prd_list li {
    margin-bottom: 1.5em;
}
.prd_list li a{
	position:relative;
	padding-left: 46px;
}
.prd_list li a:before {
    content: "";
    display: block;
    width: 40px;
    height: 40px;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    position: absolute;
    bottom: 0;
    left: 0;
}
.prd_list li a.file_xlsx:before {
    background-image: url(../img/icon-xls_rdesign_14138.png);
}
.prd_list li a.file_pdf:before {
    background-image: url(../img/icon-pdf_rdesign_14129.png);
}