fix color picker rgba to hex

app.py

@@ -21,11 +21,11 @@ def extract_waveform_animation(audio_file, window_seconds, waveform_color, backg
     duration = librosa.get_duration(y=y, sr=sr)
     FPS = 1
     fig, ax = plt.subplots()
-    line, = ax.plot([], [], lw=2, color=waveform_color)
+    line, = ax.plot([], [], lw=2, color=check_rgba(waveform_color))
     window_length = int(window_seconds * sr)
     x_vals = np.linspace(0, duration, num=len(y))
     ax.set_axis_off()
-    bg_color = background_color
+    bg_color = check_rgba(background_color)
     fig.set_facecolor(bg_color)
     
     def init():