diff --git a/assets/css/darkmode.css b/assets/css/darkmode.css
index 10c2204..54dbe96 100644
--- a/assets/css/darkmode.css
+++ b/assets/css/darkmode.css
@@ -493,6 +493,23 @@ body.nav-active {
   opacity: 1; /* Show the arrows on hover */
 }
 
+/*-----------------------------------*\
+  #E-book
+\*-----------------------------------*/
+
+.E-book-button {
+  position: fixed;
+  left: 20px;
+  bottom: 80px; 
+  background-color: #FF4D4D;
+  color: white;
+  padding: 15px;
+  border-radius: 5px;
+  cursor: pointer;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
+  z-index: 1001; 
+}
+
 /*-----------------------------------*\
   #Feedback
 \*-----------------------------------*/