How to change invoices font color by editing themes

Can anyone tell me how to change invoices font color by editing themes.If anyone knows then plz help

Themes are written in Liquid. Search the web for guidance. This is not a programming forum.

div style=“font-weight: bold; font-family:Isidora Sans; font-size: 14px; text-transform: uppercase; background-color: #FFFFFF; vertical-align: upper; color: #000000

colour can refer : HTML Color Values

change color #000000 : refer colour : HTML Color Values

sample : #FFFFFF is white
#FFFF00 is yellow