diff --git a/cfg_skilllevels.php b/cfg_skilllevels.php
index 0ce716c..df6302b 100644
--- a/cfg_skilllevels.php
+++ b/cfg_skilllevels.php
@@ -44,5 +44,5 @@ print block_gradelevel_skillmgmtservice::render_leveltable($skill_id);
 
 // add back button to return to skill management page
 $cfg_skills_url = $CFG->wwwroot."/blocks/gradelevel/cfg_skills.php";
-print "<button onclick='window.location=\"{$cfg_skills_url}\";'>".get_string('back','core')."</button>";
+print "<button class='btn' onclick='window.location=\"{$cfg_skills_url}\";'>".get_string('back','core')."</button>";
 print $OUTPUT->footer();
diff --git a/classes/levelset.php b/classes/levelset.php
index 2845085..ca0d3af 100644
--- a/classes/levelset.php
+++ b/classes/levelset.php
@@ -6,7 +6,7 @@ require_once($CFG->dirroot.'/grade/querylib.php');
 
 class block_gradelevel_levelset {
 	const UNDEFINED_BADGE_COLOR="#3F3F3F";
-	const NULL_BADGE_COLOR = "#320000";
+	const NULL_BADGE_COLOR = "000000";
 	const DEFAULT_ICON = "/blocks/gradelevel/pix/undefinedskill.svg";
 	
 	const GLOBAL_DEFAULTS = array(
@@ -346,7 +346,7 @@ class block_gradelevel_levelset {
 
 		$levels = $this->badgelevels();
 
-		$level = 0;
+		$level = -1;
 		$badge_color = static::NULL_BADGE_COLOR;
 		$current_at = 0;
 		$next_at = 0;
@@ -489,7 +489,7 @@ class block_gradelevel_levelset {
 		}
 		else
 		{
-			$points = array_keys($levels)[$level - 1];
+			$points = array_keys($levels)[$level];
 		}
 	
 		return $this->render_badge($points, $size);
diff --git a/classes/skillmgmtservice.php b/classes/skillmgmtservice.php
index 401b221..e07b529 100644
--- a/classes/skillmgmtservice.php
+++ b/classes/skillmgmtservice.php
@@ -400,10 +400,10 @@ class block_gradelevel_skillmgmtservice extends external_api
 		$s .= "</tbody>";
 		$s .= "<tfoot><tr><td class='block_gradelevel_addlevel' colspan='2'><a data-action='addlevel' href='#' onclick='return false;'>".get_string("levelcfg_addlevel",'block_gradelevel')."</a></td></td></tfoot>";
 		$s .= "</table>";
-		$s .= "<p><button data-action='savechanges'>".get_string('savechanges','core')."</button>";
+		$s .= "<br><p><button class='btn btn-primary' data-action='savechanges'>".get_string('savechanges','core')."</button>";
 		if($skill_id > 0)
 		{
-			$s .= " <button data-action='resetlevels'>".get_string('cfg_resetlevels','block_gradelevel')."</button>";
+			$s .= " <button class='btn' data-action='resetlevels'>".get_string('cfg_resetlevels','block_gradelevel')."</button>";
 		}
 		$s .= "</p>";