Update main.css, main.js

main.css

@@ -1,19 +1,8 @@
-#topbutton {
-  display: none; /* Hidden by default */
-  position: fixed; /* Fixed/sticky position */
-  bottom: 20px; /* Place the button at the bottom of the page */
-  right: 30px; /* Place the button 30px from the right */
-  z-index: 99; /* Make sure it does not overlap */
-  border: none; /* Remove borders */
-  outline: none; /* Remove outline */
-  background-color: red; /* Set a background color */
-  color: white; /* Text color */
-  cursor: pointer; /* Add a mouse pointer on hover */
-  padding: 15px; /* Some padding */
-  border-radius: 10px; /* Rounded corners */
-  font-size: 18px; /* Increase font size */
-}
-
-#topbutton:hover {
-  background-color: #555; /* Add a dark-grey background on hover */
+#gototop_button {
+  display: none;
+  position: fixed;
+  bottom: 20px;
+  right: 30px;
+  z-index: 99;
+  cursor: pointer;
 }

main.js

@@ -1,5 +1,5 @@
 // Show button on scroll
-window.onscroll = function() {toggle_gototop_button()};
+window.onscroll = function() { toggle_gototop_button() };
 
 function toggle_gototop_button() {
   gototop_button = document.getElementById("gototop_button");