Improved the header

_includes/header.html

 <header id="site-header" role="banner" aria-label="Site header">
     <div id="site-header-wrapper">
         <ul>
-            <li><img src="https://elixir-europe.org/system/files/white-orange-logo.png" /></li>
+            <li>
+              <a href="{{ site.baseurl }}/">
+                <img src="https://elixir-europe.org/system/files/white-orange-logo.png" title="ELIXIR logo" />
+              </a>
+            </li>
             <li><a href="{{ site.baseurl }}/about-node"
               {% if page.section == 'About' %} class="active" {% endif %} >
               About</a>

_sass/elixir/_layout.scss

@@ -27,7 +27,7 @@
         a {
           display: block;
           white-space: nowrap;
-          padding: 2px 12px;
+          padding: 5px 16px;
           margin-left: 0;
           color: #fefefe;
           transition: color 0.25s;

elixir-theme.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "elixir-theme"
-  spec.version       = "0.1.9"
+  spec.version       = "0.1.10"
   spec.authors       = ["jacek.lebioda"]
   spec.email         = ["jacek.lebioda@uni.lu"]