wavestone Yes it's about gtk theme... You can set font size in i3 config file from the bar {}
block, as an example:
bar {
font pango:FontAwesome 14
}
But this is a global declaration and your text blocks font will increase too... You can't declare font size by block. The simpliest solution I've found for you is to setup two different bars with too different configs, one for your icons and the other for regular text blocks.
In i3 config you can do:
bar {
font pango:FontAwesome 14
status_command i3blocks -c ~/.config/i3/i3blocks_1.conf
}
bar {
font pango:Roboto Bold 10
status_command i3blocks -c ~/.config/i3/i3blocks_2.conf
}
I've not tested but it might work... let me know...