diff --git a/src/thsf/static/css/style.css b/src/thsf/static/css/style.css
index 418ae14..652a72d 100644
--- a/src/thsf/static/css/style.css
+++ b/src/thsf/static/css/style.css
@@ -53,6 +53,18 @@ span.place {
   font-family: pfdintextcomppromedium;
 }
 
+#content_wrapper {
+  position: fixed;
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-start;
+  align-items: center;
+  width: 100vw; /* viewport width */
+  height: 100vh; /* viewport height */
+  overflow-y: scroll;
+  overflow-x: hidden;
+}
+
 #main_wrapper {
   display: flex;
   flex-direction: line;
@@ -60,13 +72,6 @@ span.place {
   align-items: start;
 }
 
-#content_wrapper {
-  display: flex;
-  flex-direction: column;
-  justify-content: flex-start;
-  align-items: center;
-}
-
 #center_wrapper {
   display: flex;
   flex-direction: column;