Use the class .md-file
Add inner text to the element<tag>TXT</tag>
You can use an icon, check Fontawesome<i class="fas fa-music"></i>
Small size .md-file-sm
Normal size default
Large size .md-file-lg
Extra Large size .md-file-xl
.md-file-red
.md-file-pink
.md-file-purple
.md-file-deep-purple
.md-file-indigo
.md-file-blue
.md-file-light-blue
.md-file-cyan
.md-file-teal
.md-file-green
.md-file-light-green
.md-file-lime
.md-file-yellow
.md-file-amber
.md-file-orange
.md-file-deep-orange
.md-file-brown
.md-file-grey
.md-file-blue-grey