EN/CityGML-Tutorial/chapter-1:-Intro-CityGML.md

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 In order to describe a city model, CityGML utilizes thematic modules. The base module is the CityGML Core which gets extended by defined thematic modules such as Building, Bridge, Vegetation, Transportation, WaterBody, Relief, LandUse, Appearance etc. In this tutorial, the building module will be used to explain the CityGML concepts. Examples will be given in CityGML 2.0 as most existing tools are using this version. However, the examples will be given in CityGML 3.0 XML encoding as well to see the differences of CityGML 2.0 and CityGML 3.0.
 
-![CityGML_Module.drawio](uploads/112944c6119347be4c46c1bceddf694e/CityGML_Module.drawio.png)                 **Left**: CityGML ver. 2.0 Modules ([Overview](https://docs.opengeospatial.org/guides/20-066.html))                                            **Right**: CityGML ver. 3.0 Modules ([Overview](https://portal.ogc.org/files/?artifact_id=47842))
+![CityGML_Module.drawio](uploads/112944c6119347be4c46c1bceddf694e/CityGML_Module.drawio.png)
 
-The following example shows a CityModel (CityGML 2.0) that makes use of several modules including Building, Bridge, WaterBody, Vegetation, Relief, and Transportation.
+<div align="center">
+
+**Left**: CityGML 2.0 Modules ([Overview](https://docs.opengeospatial.org/guides/20-066.html)) **Right**: CityGML 3.0 Modules ([Overview](https://portal.ogc.org/files/?artifact_id=47842))
 
-<dl>
-<dt>
+</div>
 
+The following example shows a CityModel (CityGML 2.0) that makes use of several modules including Building, Bridge, WaterBody, Vegetation, Relief, and Transportation.
 ![Bildbeschreibung](uploads/5f7b4ff3ea8229a7daa9561c753425a7/3D_DLM_Stoeckach.png "Kap-LoD-1-Gebäudehöhen-ALKIS3D")
+<div align="center">
+
+**CityGML Model Stuttgart-Stöckach**
 
-</dt>
-<dd>City Model Stuttgart Stöckach</dd>
-</dl>CityGML Model Stuttgart-Stöckach, the model itself was created by L. Rothengass as prt of his Master Thesis at HFT Stuttgart using the software [3dfier](https://github.com/tudelft3d/3dfier) and data provided by the State Office for Spatial Information and Land Development (LGL BW) (base DLM and LiDAR data) and the City of Stuttgart (tree cadastre and LoD2 building module).
+</div>
+</dl>The CityGML model Stuttgart-Stöckach was created by L. Rothengass as a part of his Master Thesis at HFT Stuttgart using the software [3dfier](https://github.com/tudelft3d/3dfier) and data provided by the State Office for Spatial Information and Land Development (LGL BW) (base DLM and LiDAR data) and the City of Stuttgart (tree cadastre and LoD2 building module).
 
 ## CityGML Core