diff --git a/layouts/shortcodes/splice/calc_loop.html b/layouts/shortcodes/splice/calc_loop.html
index f4ecd4f..dd9f83c 100644
--- a/layouts/shortcodes/splice/calc_loop.html
+++ b/layouts/shortcodes/splice/calc_loop.html
@@ -38,9 +38,9 @@ function Calculate(obj)
          </select>
 
         <label for="loop_dia">Loop diameter (in centimeter)</label>
-        <input type="number" min="0" step=".1" class="form-control form-control-lg" id="loop_dia" aria-describedby="emailHelp" placeholder="Enter loop diameter" onChange="Calculate(this.form)">
+        <input type="number" min="0" step=".1" class="form-control form-control-lg" id="loop_dia" placeholder="Enter loop diameter" onChange="Calculate(this.form)">
 
-        <input type="button" onClick="Calculate(this.form)" class="btn btn-primary" value="Calculate"/>
+        <button type="button" class="btn btn-primary" onClick="Calculate(this.form)">Calculate</button>
     </div>
     <hr>
     <div class="form-group">