Make "save" button work without javascript

static/style.css

@@ -271,7 +271,7 @@ body, form {
     padding-right: 1.5em;
   }
 
-  main > div:first-child > a > .text {
+  main > div:first-child > button > .text {
     display: none;
   }
 

views/index.ejs

@@ -237,7 +237,7 @@
 	<a class="randomize white-button"><span class="fa fa-random"></span></a>
 	<button type="submit" id="tweet-button" name="target" value="twitter" class="blue-button" target="_blank" href="https://twitter.com/intent/tweet?text=Soutenez La Quadrature du Net !"><span class="text">Tweet </span><span class="fa fa-twitter"></span></button>
 	<button type="submit" id="fb-button" name="target" value="facebook" class="blue-button" target="_blank" href="https://www.facebook.com/sharer/sharer.php?u="><span class="text">Partager </span><span class="fa fa-facebook-square"></span></button>
-	<a id="save-image" class="white-button" download="lqdn-slogan.png"><span class="text">Enregistrer </span><span class="fa fa-save"></span></a>
+	<button type="submit" id="save-image" class="white-button" download="lqdn-slogan.png"><span class="text">Enregistrer </span><span class="fa fa-save"></span></a>
       </div>
       <div id="credits">
 	<p><strong>Site hébergé par <a href="https://laquadrature.net">La Quadrature du Net</a></strong></p>