fix css in demo apps

Author: jourdain

demos/pyvista-terrain-following-mesh/app.py

@@ -118,7 +118,7 @@ def updateWarp(factor=1):
                     ),
                 ),
             ],
-            style={"height": "12%", "align-items": "center"},
+            style={"height": "12%", "alignItems": "center"},
         ),
         html.Div(
             html.Div(vtk_view, style={"height": "100%", "width": "100%"}),

demos/slice-rendering/app.py

@@ -84,7 +84,7 @@
     style={"height": "calc(100vh - 30px)"},
     children=[
         html.Div(
-            style={"height": "20%", "display": "flex", "align-items": "center"},
+            style={"height": "20%", "display": "flex", "alignItems": "center"},
             children=[html.Br(), controls, html.Br(),],
         ),
         html.Div(slice_view, style={"height": "80%"}),

demos/usage-algorithm/app.py

@@ -55,7 +55,7 @@
 
 app.layout = dbc.Container(
     fluid=True,
-    style={"margin-top": "15px", "height": "calc(100vh - 30px)"},
+    style={"marginTop": "15px", "height": "calc(100vh - 30px)"},
     children=[
         dbc.Row(
             [