diff --git a/schmeckels/serve.py b/schmeckels/serve.py
index 978ae58..4bcd212 100644
--- a/schmeckels/serve.py
+++ b/schmeckels/serve.py
@@ -39,26 +39,30 @@ def index():
         )
         if tag_sum:
             if tag_sum >= 0:
-                tag_sum_in[tag] = {"sum":tag_sum, "monthly": floor(tag_sum/months)}
+                tag_sum_in[tag] = {"sum": tag_sum, "monthly": floor(tag_sum / months)}
             else:
-                tag_sum_out[tag] = {"sum":tag_sum, "monthly": floor(tag_sum/months)}
+                tag_sum_out[tag] = {"sum": tag_sum, "monthly": floor(tag_sum / months)}
 
-    monthly_sum = { "in": format_amount(sum([v["monthly"] for k,v in tag_sum_in.items()])),
-                     "out":format_amount(sum([v["monthly"] for k,v in tag_sum_out.items()]))}
+    monthly_sum = {
+        "in": format_amount(sum([v["monthly"] for k, v in tag_sum_in.items()])),
+        "out": format_amount(sum([v["monthly"] for k, v in tag_sum_out.items()])),
+    }
     tag_sum_in = {
         k: format_amount(v) for k, v in sorted(tag_sum_in.items(), key=lambda item: float(item[1]["sum"]), reverse=True)
     }
     tag_sum_out = {k: format_amount(v) for k, v in sorted(tag_sum_out.items(), key=lambda item: float(item[1]["sum"]))}
 
-    return render_template("index.html", tag_sum_in=tag_sum_in, tag_sum_out=tag_sum_out, months=months, monthly_sum=monthly_sum)
+    return render_template(
+        "index.html", tag_sum_in=tag_sum_in, tag_sum_out=tag_sum_out, months=months, monthly_sum=monthly_sum
+    )
 
 
 @app.route("/tags")
 def tags():
     tags = session.query(Tag).all()
 
-    #Sort alphabetically
-    tags = sorted(tags, key=lambda item:item.name)
+    # Sort alphabetically
+    tags = sorted(tags, key=lambda item: item.name)
     return render_template("tags.html", tags=tags)
 
 
@@ -66,11 +70,17 @@ def tags():
 def tag(name):
     tag = session.query(Tag).filter(Tag.name == name).first()
     transactions = session.query(Transaction).filter(Transaction.tags.any(id=tag.id)).all()
-    sum_months = session.query(func.sum(Transaction.amount).label("amount"), func.strftime("%Y-%m",Transaction.date).label("month")).filter(Transaction.tags.any(id=tag.id)).group_by("month").all()
+    sum_months = (
+        session.query(
+            func.sum(Transaction.amount).label("amount"), func.strftime("%Y-%m", Transaction.date).label("month")
+        )
+        .filter(Transaction.tags.any(id=tag.id))
+        .group_by("month")
+        .all()
+    )
     months = []
     for m in sum_months:
-        months.append({'amount' : format_amount(m['amount']),
-        "month": m['month']})
+        months.append({"amount": format_amount(m["amount"]), "month": m["month"]})
 
     return render_template("tag.html", tag=tag, months=months, transactions=transactions)