[BUG] Nerd font icon doesn't show in widget

[legoraft]

Checklist before submitting an issue

• I have searched through the existing closed and open issues for eww and made sure this is not a duplicate
• I have specifically verified that this bug is not a common user error
• I am providing as much relevant information as I am able to in this bug report (Minimal config to reproduce the issue for example, if applicable)

Description of the bug

I have an overlay widget which displays the volume and brightness. I have the nerd font icons installed and am running the eww window from a bash script. When I run this script for the volume icon, it appears as expected, but on the brightness icon it just shows an ellipsis. I have tried running the overlay window directly from the command line, but the icon also doesn't show up correctly. I have also added the nerd font icons font to the scss file.

Reproducing the issue

1. Use the following script and window files.
2. Run the ./overlah.sh volume up command and see the volume icon.
3. Run the ./overlay.sh brightness up command and see the ellipsis.

Expected behaviour

I expected seeing the brightness icon. The nerd font icons appear in the terminal and in my text editor.

Additional context

Platform and environment

• wayland
• compositor: river
• version: 0.5.0
• distro: void linux