Export plot to svg instead of png

templates/base.html

@@ -13,7 +13,7 @@
 </header>
 
 <main>
-    <img src="{{ image|safe }}"/>
+    {{ image|safe }}
     {{ tables|safe }}
 </main>
 </article>

wsgi.py

@@ -1,4 +1,3 @@
-import base64
 import datetime
 import io
 from itertools import chain
@@ -11,7 +10,6 @@ import numpy as np
 import pandas as pd
 from flask import Flask, render_template, request
 from flask_caching import Cache
-from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
 
 from download_digital import construct_dataframe, get_bez_data
 
@@ -84,7 +82,7 @@ def plot(
         sum_val = current_df[["Digitale Befragung"]].sum().iloc[0]
         df.loc[datetime.datetime.now()] = sum_val
 
-    plt.figure(dpi=300)
+    fig = plt.figure(dpi=300)
 
     # fill weekends
     max_date = max(data_dict.keys())
@@ -155,15 +153,12 @@ def plot(
     plt.axhline(y=total_target, color="#48a9be", linestyle="--")
     plt.tight_layout()
 
-    # Convert plot to PNG image
-    pngImage = io.BytesIO()
-    FigureCanvas(plt.gcf()).print_png(pngImage)
+    # Convert plot to SVG image
+    imgdata = io.StringIO()
+    fig.savefig(imgdata, format="svg")
+    svgImage.seek(0)  # rewind the data
 
-    # Encode PNG image to base64 string
-    pngImageB64String = "data:image/png;base64,"
-    pngImageB64String += base64.b64encode(pngImage.getvalue()).decode("utf8")
-
-    return pngImageB64String
+    return svgImage.read()
 
 
 @app.route("/")