adjusted buttons

Author: ElviraMustafina

docs/topics/tour/kotlin-tour-welcome.md

@@ -13,12 +13,13 @@ level. Each chapter contains:
 
 To grasp the fundamentals of Kotlin, take the beginner tour. To deepen your understanding of Kotlin, take the intermediate tour.
 
+<p></p> <!-- workaround for MRK057: Paragraph can only contain inline elements-->
 <list columns="2">
     <li>
-        <a href="kotlin-tour-hello-world.md"><img src="start-beginner-tour.svg" width="300" alt="Start the beginner's Kotlin tour" style="block"/></a>
+        <a href="kotlin-tour-hello-world.md"><img src="start-beginner-tour.svg" alt="Start the beginner's Kotlin tour" type="block" height="30"/></a>
     </li>
     <li>
-        <a href="kotlin-tour-intermediate-extension-functions.md"><img src="start-intermediate-tour.svg" alt="Start the intermediate Kotlin tour" style="block"/></a>
+        <a href="kotlin-tour-intermediate-extension-functions.md"><img src="start-intermediate-tour.svg" alt="Start the intermediate Kotlin tour" type="block" height="30"/></a>
     </li>
 </list>