diff --git a/it4i_theme/header.html b/it4i_theme/header.html
index be94f36727af10188471dfe5159c7d8a3506318a..05f924d0b9ae03d73a1f1292e272da409f949503 100644
--- a/it4i_theme/header.html
+++ b/it4i_theme/header.html
@@ -23,10 +23,10 @@
       </div>
     </div>
       <div class="button button-github" role="button" aria-label="GitHub">
-        <a href="https://gitlab.it4i.cz/kru0052/docs.it4i" title="on GitLab" target="_blank" ><img src="/img/git.png" width="31" height="31"></a>
+        <a href="https://gitlab.it4i.cz/kru0052/docs.it4i" title="on GitLab" target="_blank" ><img src="/img/git.png" width="30" height="30"></a>
       </div>
       <div class="button button-twitter" role="button" aria-label="Twitter">
-        <a href="all.pdf" title="DOWNLOAD PDF VERSION" target="_blank"><img src="/img/download.png" width="27" height="27"></a>
+        <a href="all.pdf" title="DOWNLOAD PDF VERSION" target="_blank"><img src="/img/download.png" width="30" height="30"></a>
       </div>
     <div class="button button-search" role="button" aria-label="Search">
       <label class="toggle-button icon icon-search" title="Search" for="toggle-search"></label>