diff --git a/src/www/services_ntpd_gps.php b/src/www/services_ntpd_gps.php
index fd8c0fcd3..0a8971318 100644
--- a/src/www/services_ntpd_gps.php
+++ b/src/www/services_ntpd_gps.php
@@ -503,11 +503,19 @@ SureGPS =    #Sure Electronics SKG16B
                           <textarea name="initcmd" class="formpre" id="gpsinitcmd" cols="65" rows="7"><?=base64_decode($pconfig['initcmd']);?></textarea><br />
                           <?=gettext("Note: Commands entered here will be sent to the GPS during initialization. ".
                                      "Please read and understand your GPS documentation before making any changes here.");?><br /><br />
-                          <strong><?=gettext("NMEA checksum calculator");?>:</strong>
-                          <br />
-                          <?=gettext('Enter the text between "$" and "*" of a NMEA command string:');?><br /><input name="nmeastring" type="text" id="nmeastring" size="30" value="" style="display:inline;" />
-                          <input class="btn btn-primary" type="button" id="calcnmeachk" value="<?=gettext("Calculate NMEA Checksum");?>" /><br />
-                          <?= gettext("Checksum:") ?> <span id="nmeachecksum"><?=gettext("Please click the \"Calculate NMEA Checksum\" to get a result.");?></span>
+                          <strong><?=gettext("NMEA checksum calculator");?></strong><br /><br />
+                          <?=gettext('Enter the text between "$" and "*" of a NMEA command string.');?><br /><br />
+                          <div class="row" style="max-width: 348px">
+                            <div class="col-xs-12">
+                              <div class="input-group">
+                                <input name="nmeastring" type="text" id="nmeastring" />
+                                <span class="input-group-btn">
+                                  <label class="btn btn-primary" id="calcnmeachk"><?= gettext('Calculate') ?></label>
+                                </span>
+                              </div>
+                            </div>
+                          </div><br />
+                          <?= gettext("Checksum:") ?> <span id="nmeachecksum"><?=gettext("Please click the \"Calculate\" to get a result.");?></span>
                         </div>
                       </td>
                     </tr>