css.py

import gradio as gr

theme = gr.themes.Glass(
    primary_hue="yellow",
    secondary_hue=gr.themes.Color(secondary_100="#736c1c", secondary_200="#716823", secondary_300="#fde047", secondary_400="#facc15", secondary_50="#f2e821", secondary_500="#eab308", secondary_600="#ca8a04", secondary_700="#a16207", secondary_800="#854d0e", secondary_900="#713f12", secondary_950="#653b12"),
    neutral_hue=gr.themes.Color(neutral_100="#2a1304", neutral_200="#e7e5e4", neutral_300="#d6d3d1", neutral_400="#a8a29e", neutral_50="#97ae29", neutral_500="#78716c", neutral_600="#57534e", neutral_700="#44403c", neutral_800="#292524", neutral_900="#1c1917", neutral_950="#0f0e0d"),
    text_size="text_lg",
    spacing_size="spacing_md",
    radius_size=gr.themes.Size(radius_lg="8px", radius_md="6px", radius_sm="4px", radius_xl="12px", radius_xs="2px", radius_xxl="22px", radius_xxs="5px"),
    font=[gr.themes.GoogleFont('Optima'), gr.themes.GoogleFont('Candara'), gr.themes.GoogleFont('Noto Sans'), gr.themes.GoogleFont('source-sans-pro')],
    font_mono=[gr.themes.GoogleFont('IBM Plex Mono'), gr.themes.GoogleFont('ui-monospace'), gr.themes.GoogleFont('Consolas'), gr.themes.GoogleFont('monospace')],
).set(
    body_background_fill='*primary_500',
    body_background_fill_dark='*primary_50',
    background_fill_primary='*primary_50',
    background_fill_primary_dark='*primary_50'
)

with gr.Blocks(theme=theme) as demo:
    ...