diff --git a/bookwyrm/imagegenerators.py b/bookwyrm/imagegenerators.py
index fd1eb498..31438f74 100644
--- a/bookwyrm/imagegenerators.py
+++ b/bookwyrm/imagegenerators.py
@@ -1,66 +1,79 @@
 from imagekit import ImageSpec, register
 from imagekit.processors import ResizeToFit
 
+
 class BookXSmallWebp(ImageSpec):
     processors = [ResizeToFit(80, 80)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookXSmallJpg(ImageSpec):
     processors = [ResizeToFit(80, 80)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 class BookSmallWebp(ImageSpec):
     processors = [ResizeToFit(100, 100)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookSmallJpg(ImageSpec):
     processors = [ResizeToFit(100, 100)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 class BookMediumWebp(ImageSpec):
     processors = [ResizeToFit(150, 150)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookMediumJpg(ImageSpec):
     processors = [ResizeToFit(150, 150)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 class BookLargeWebp(ImageSpec):
     processors = [ResizeToFit(200, 200)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookLargeJpg(ImageSpec):
     processors = [ResizeToFit(200, 200)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 class BookXLargeWebp(ImageSpec):
     processors = [ResizeToFit(250, 250)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookXLargeJpg(ImageSpec):
     processors = [ResizeToFit(250, 250)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 class BookXxLargeWebp(ImageSpec):
     processors = [ResizeToFit(500, 500)]
     format = "WEBP"
     options = {"quality": 95}
 
+
 class BookXxLargeJpg(ImageSpec):
     processors = [ResizeToFit(500, 500)]
     format = "JPEG"
     options = {"quality": 95}
 
+
 register.generator("bw:book:xsmall:webp", BookXSmallWebp)
 register.generator("bw:book:xsmall:jpg", BookXSmallJpg)
 register.generator("bw:book:small:webp", BookSmallWebp)