Set icon images depending on file types of URLs
.container a[href$=".pdf"],
.container a[href$=".mp3"],
.container a[href$=".doc"],
.container a[href$=".docx"],
.container a[href$=".xls"],
.container a[href$=".xlsx"],
.container a[href$=".txt"],
.container a[href$=".gz"] {
display: inline-block;
line-height: 48px;
padding-left: 58px;
background: transparent no-repeat center left;
}
.container a[href$=".pdf"] {
background-image: url(images/file_pdf.png);
}
.container a[href$=".mp3"] {
background-image: url(images/file_mp3.png);
}
.container a[href$=".doc"],
.container a[href$=".docx"] {
background-image: url(images/file_doc.png);
}
.container a[href$=".xlsx"] {
background-image: url(images/file_xls_3.png);
}
.container a[href$=".txt"],
.container a[href$=".gz"] {
background-image: url(images/file_txt.png);
}