fixed slack link

README.md

@@ -15,10 +15,10 @@ pinned: false
          <img alt="" src="https://huggingface.co/spaces/deepset/README/resolve/main/haystack-logo-colored.svg" class="w-40"/>
      </div>
     <p class="lg:col-span-2"><a href="https://deepset.ai">deepset.ai</a> is the company behind <strong><a href="https://haystack.deepset.ai/">Haystack</a></strong>, an open source NLP framework to help you develop production ready applications powered by various NLP tasks such as Question Answering. We host our models and datasets we create on Hugging Face 🤗! For more info on Haystack, visit our <strong><a href="https://github.com/deepset-ai/haystack">GitHub</a></strong> repo and <strong><a href="https://haystack.deepset.ai">Documentation</a></strong> 
-    /p>
-    <a href="https://haystack.deepset.ai/community/join" >
-        <div class="w-full h-10 rounded-lg flex items-center justify-center">
-            <img alt="" src="https://huggingface.co/spaces/deepset/README/resolve/main/join-slack.png"/>
+    </p>
+    <a class="lg:col-span-2" href="https://haystack.deepset.ai/community/join" >
+        <div class="w-full rounded-lg flex justify-center items-center">
+            <img class="h-20" alt="" src="https://huggingface.co/spaces/deepset/README/resolve/main/join-slack.png"/>
         </div>
     </a>   
 </div>