import panel as pn

pn.extension()

idle = pn.indicators.LoadingSpinner(value=False, width=100, height=100)
loading = pn.indicators.LoadingSpinner(value=True, width=100, height=100)

pn.Row(idle, loading)

grid = pn.GridBox('', 'light', 'dark', ncols=3)

for color in pn.indicators.LoadingSpinner.param.color.objects:
    dark = pn.indicators.LoadingSpinner(width=50, height=50, value=True, color=color, bgcolor='dark')
    light = pn.indicators.LoadingSpinner(width=50, height=50, value=True, color=color, bgcolor='light')
    grid.extend((color, light, dark))

grid