diff --git a/docs/advancedtopics/integrate_code.rst b/docs/advancedtopics/integrate_code.rst
index 5267a1d..4d75cc6 100644
--- a/docs/advancedtopics/integrate_code.rst
+++ b/docs/advancedtopics/integrate_code.rst
@@ -29,6 +29,7 @@ split time feature and a display of the elapsed time. A button-controlled GUI of
 (inactive buttons are greyed out):
 
 .. image:: /images/stopwatch_gui.png
+    :align: center
 
 Essentially, the stopwatch simply displays a value, representing the elapsed time (expressed in seconds), which is
 initially 0. By clicking on the *start* button the stopwatch starts running. When clicking on *stop*, the stopwatch stops running.
@@ -39,7 +40,7 @@ The idea is that the buttons will trigger state changes and actions carried out
 Taking abstraction of the concrete implementation, the statechart would essentially look as follows, with one main *active* state containing two parallel substates *timer* and *display*.
 
 .. image:: /images/stopwatch_overview.png
-
+    :align: center
 
 Controlling a statechart from within the environment
 ----------------------------------------------------
@@ -51,6 +52,7 @@ Conversely, the statechart itself can send events back to the source code to upd
 This statechart looks as follows:
 
 .. image:: /images/stopwatch_with_logic.png
+    :align: center
 
 Here is the YAML file containing the  textual description of this statechart:
 
@@ -96,6 +98,7 @@ The statechart is simpler than in the previous example: one parallel region hand
 running status of the stopwatch, and a second one handles its split features.
 
 .. image:: /images/stopwatch_with_object.png
+    :align: center
 
 .. literalinclude:: /examples/stopwatch_external.yaml
     :language: yaml
diff --git a/docs/format.rst b/docs/format.rst
index ef80449..8ef3561 100644
--- a/docs/format.rst
+++ b/docs/format.rst
@@ -215,6 +215,7 @@ Elevator
 The Elevator statechart is one of the running examples in this documentation. Its visual description (currently not supported by Sismic) could look as follows:
 
 .. image:: /images/elevator.png
+    :align: center
 
 The corresponding YAML description is given below. To make the statechart self-contained, a Python class ``Doors``
 is included containing two methods ``open()`` and ``close()`` and a boolean variable ``opened``. Upon entering in the *active* state, a ``doors`` object of this class will be created and initialised by setting the value of ``opened`` to ``True``.