!! Set a default font and font size as below:
*.font: Fira Code:size=12
*.symbols: Font Awesome 5 Free:size=11

/* dwm config */
dwm.borderpx: 2
dwm.gappx: 15

/* st config */
st.font: Fira Code:size=12
st.symbols: Font Awesome 5 Free:size=12
st.termname: st-256color
st.borderpx: 5