def overlay_imgs(s_img, l_img, x_offset=50, y_offset=50):
    """
    Overlay two numpy array images
    
    Parameters
    ----------
        s_img: numpy array, small image
        l_img: numpy array, large image
        x_offset: left padding from large to small overlaid image
        y_offset: top padding from large to small overlaid image
        
    Returns
    -------
        image_arr: numpy array containing large image with insert 
        of small image inlaid
        
    Example
    --------
    
    
    """
    l_img[y_offset:y_offset+s_img.shape[0], x_offset:x_offset+s_img.shape[1]] = s_img
    return l_img