diff --git a/src/cmap/_color.py b/src/cmap/_color.py
index db57f085d..56cde019b 100644
--- a/src/cmap/_color.py
+++ b/src/cmap/_color.py
@@ -46,6 +46,7 @@
     RGBTuple,  # 3-tuple of all ints or all floats
     RGBATuple,  # 4-tuple of all floats, or 3 ints and 1 float
     np.ndarray,  # 3- or 4-element rgb(a) vector
+    np.number,
     list[Union[float, int]],  # 3- or 4-element rgb(a) vector
     "Color",  # another color object
 ]
diff --git a/src/cmap/_colormap.py b/src/cmap/_colormap.py
index 18a9ff5f7..ba4712891 100644
--- a/src/cmap/_colormap.py
+++ b/src/cmap/_colormap.py
@@ -1077,7 +1077,7 @@ def to_css(
             If `True`, return colors as hex strings, by default use `rgba()` strings.
         """
         if max_stops and len(self._stops) > max_stops:
-            stops = tuple(np.linspace(0, 1, max_stops))
+            stops: tuple[np.floating, ...] = tuple(np.linspace(0, 1, max_stops))
             colors = tuple(Color(c) for c in self.to_lut(max_stops))
         else:
             stops, colors = self.stops, self.colors