Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 170)

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Shooting Tips
z In bright light, decrease the ISO speed.
If the exposure setting in the viewfinder blinks, decrease the ISO
speed.
z Detach the lens hood. Do not get too close to the subject.
If the lens has a hood attached or you are too close to the subject, the
bottom of the picture may look dark due to the obstructed flash light.
For important shots, play back the image and check to make sure the
picture does not look unnaturally dark at the bottom part.