use pure style buttons

templates/search.html

@@ -68,7 +68,7 @@
         </div>
     </div>
 
-    <input type="submit" value="Search" class="pure-button">
+    <input type="submit" value="Search" class="pure-button-primary pure-button">
 
     <hr>
     <h2>Preview</h2>
@@ -94,7 +94,7 @@
         <h6>Page</h6>
         {% if page > 0 %}
         <div class="nav-prev">
-            <button name="page" value="{{ page - 1 }}" type="submit">Previous</button>
+            <button name="page" value="{{ page - 1 }}" type="submit" class="pure-button">Previous</button>
         </div>
         {% endif %}
         <div class="pages">
@@ -108,7 +108,7 @@
         </div>
         {% if page + 1 < total_pages %}
         <div class="nav-next">
-            <button name="page" value="{{ page + 1 }}" type="submit">Next</button>
+            <button name="page" value="{{ page + 1 }}" type="submit" class="pure-button">Next</button>
         </div>
         {% endif %}