Small beautification changes

app.py

@@ -135,7 +135,7 @@ st.markdown(
         "squared distances between each point and the circle's circumference. "
         "<b>Levenberg-Marquardt Optimization</b> is used to fit models "
         "(like circles) to point cloud data by minimizing the error between "
-        "the model and the actual points.</div>",
+        "the model and the actual points.</div><br>",
         unsafe_allow_html=True
 )
     

utils.py

@@ -4,10 +4,10 @@ from scipy.spatial import ConvexHull
 from scipy.optimize import least_squares
 
 CLASSES = [
-    'Betula_pendula',
-    'Fagus_sylvatica', 
-    'Picea_abies',
-    'Pinus_sylvestris'
+    'Betula pendula',
+    'Fagus sylvatica', 
+    'Picea abies',
+    'Pinus sylvestris'
 ]
 
 def fit_circle(x, y):