replaced <p></p> formatting

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 <div>
     <h1>Helmholtz IT for Science</h1>
-    <p>
-    <details>
-     <summary>
-        <strong>HIFIS builds and sustains an excellent IT infrastructure connecting all Helmholtz research fields and centres.</strong>
-     </summary>
-     <div>
-        <p>
-        This includes a secure and easy-to-use collaborative environment with efficiently accessible IT services from anywhere. 
-        HIFIS further supports Research Software Engineering (RSE) with a high level of quality, visibility and sustainability.
-        </p><p>
-        The HIFIS clusters develop technologies, processes and policy frameworks for harmonized access to fundamental backbone services, such as Helmholtz AAI, and Helmholtz Cloud services. HIFIS Software also provides education, technology, consulting and community services.
-        </p>
-     </div>
+    <details class="my-3">
+        <summary>
+            <strong>HIFIS builds and sustains an excellent IT infrastructure connecting all Helmholtz research fields
+                and centres.</strong>
+        </summary>
+        <div>
+            <p>
+                This includes a secure and easy-to-use collaborative environment with efficiently accessible IT services
+                from anywhere.
+                HIFIS further supports Research Software Engineering (RSE) with a high level of quality, visibility and
+                sustainability.
+            </p>
+            <p>
+                The HIFIS clusters develop technologies, processes and policy frameworks for harmonized access to
+                fundamental backbone services, such as Helmholtz AAI, and Helmholtz Cloud services. HIFIS Software also
+                provides education, technology, consulting and community services.
+            </p>
+        </div>
     </details>
-    </p>
 </div>
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     <div class="services-title-buttons">