Version-Release number of selected component:
python3-caribou-0.4.21-15.fc31

Additional info:
reporter:       libreport-2.11.3
cgroup:         0::/user.slice/user-1000.slice/user/dbus\x2d:1.2\x2dorg.gnome.Caribou.Keyboard.slice/dbus-:1.2-org.gnome.Caribou.Keyboard
cmdline:        python3 -m caribou.antler.main
crash_function: _load_style
exception_type: gi.repository.GLib.GError
executable:     /usr/lib/python3.7/site-packages/caribou/antler/main.py
interpreter:    python3-3.7.5-2.fc31.x86_64
kernel:         5.4.7-200.fc31.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
keyboard_view.py:297:_load_style:gi.repository.GLib.GError: gtk-css-provider-error-quark: style.css:16:8not a number (1)

Traceback (most recent call last):
  File "/usr/lib64/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib64/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.7/site-packages/caribou/antler/main.py", line 71, in <module>
    command(args).run()
  File "/usr/lib/python3.7/site-packages/caribou/antler/main.py", line 17, in __init__
    self.window = AntlerWindowEntry(AntlerKeyboardView)
  File "/usr/lib/python3.7/site-packages/caribou/antler/window.py", line 413, in __init__
    AntlerWindow.__init__(self, keyboard_view_factory, placement)
  File "/usr/lib/python3.7/site-packages/caribou/antler/window.py", line 225, in __init__
    self.keyboard_view = keyboard_view_factory (keyboard_type=settings.keyboard_type.value)
  File "/usr/lib/python3.7/site-packages/caribou/antler/keyboard_view.py", line 233, in __init__
    [GLib.get_user_data_dir()] + list(GLib.get_system_data_dirs()))
  File "/usr/lib/python3.7/site-packages/caribou/antler/keyboard_view.py", line 297, in _load_style
    provider.load_from_path(fn)
gi.repository.GLib.GError: gtk-css-provider-error-quark: style.css:16:8not a number (1)

Local variables in innermost frame:
self: <keyboard_view.AntlerKeyboardView object at 0x7fa0c074deb0 (caribou+antler+keyboard_view+AntlerKeyboardView at 0x55ec2b9fe270)>
provider: <Gtk.CssProvider object at 0x7fa0c0751460 (GtkCssProvider at 0x7fa0a0005a20)>
filename: 'style.css'
search_path: ['/home/ulrichp/.local/share', '/usr/share', '/home/ulrichp/.local/share/flatpak/exports/share/', '/var/lib/flatpak/exports/share/', '/usr/local/share/', '/usr/share/']
spath: ['/home/ulrichp/.local/share', '/usr/share', '/home/ulrichp/.local/share/flatpak/exports/share/', '/var/lib/flatpak/exports/share/', '/usr/local/share/', '/usr/share/']
directory: '/usr/share'
fn: '/usr/share/antler/style.css'