diff --git a/_content/other/teach.md b/_content/other/teach.md
deleted file mode 100644
index 36756e2..0000000
--- a/_content/other/teach.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-title: teaching
-layout: page.njk
----
-
-# teach
-
-Something about this project
\ No newline at end of file
diff --git a/assets/css/master.css b/assets/css/master.css
index 46e84cc..cd4e0ea 100644
--- a/assets/css/master.css
+++ b/assets/css/master.css
@@ -134,7 +134,10 @@ nav#toTop > span {
   display: block;
   opacity: 0.0;
   transform: translateY(-2em);
-  transition: transform ease 0.5s, opacity ease 1s;
+  background-color: rgba(255,255,255,0.0);
+  padding: 0.3em 0.5em 0.5em;
+  border-radius: 1em;
+  transition: transform ease 0.5s, opacity ease 1s, background-color ease 0.5s 0.5s;
 }
 
 nav#toTop > span::after {
@@ -143,7 +146,8 @@ nav#toTop > span::after {
 }
 
 nav#toTop.active > span {
-  opacity: 0.4;
+  opacity: 0.5;
+  background-color: rgba(255,255,255,0.9);
   transform: translateY(0em);
 }