diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index 4b201e2f08..b60fc9c9ef 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -38,10 +38,10 @@ from viewer.constants import READER_BACKGROUND_URL
 
 add_extra_css(def():
     sel = '.book-side-margin'
-    ans = build_rule(sel, cursor='pointer', text_align='center', height='100vh', user_select='none', display='flex', align_items='center', justify_content='center')
-    ans += build_rule(sel + ' > svg', display='none')
-    ans += build_rule(sel + ':hover > svg', display='block')
-    ans += build_rule(sel + ':active > svg', color=get_color('window-hover-foreground'), display='block', transform='scale(2)')
+    ans = build_rule(sel, cursor='pointer', text_align='center', height='100vh', user_select='none', display='flex', align_items='center', justify_content='space-between')
+    ans += build_rule(sel + ' > .arrow', display='none')
+    ans += build_rule(sel + ':hover > .arrow', display='block')
+    ans += build_rule(sel + ':active > .arrow', color=get_color('window-hover-foreground'), display='block', transform='scale(2)')
     return ans
 )
 
@@ -146,9 +146,14 @@ def margin_elem(sd, which, id, onclick, oncontextmenu):
 
 def side_margin_elem(self, sd, which):
     ans = E.div(
-        svgicon(f'caret-{which}'), style='width:{}px;'.format(sd.get(f'margin_{which}', 20)),
-        class_='book-side-margin', id=f'book-{which}-margin', onclick=self.side_margin_clicked.bind(None, which),
-        oncontextmenu=self.margin_context_menu.bind(None, which), onwheel=self.on_margin_wheel.bind(None, which))
+        E.div(class_='arrow', svgicon(f'caret-{which}', '100%', '100%')),
+
+        style='width:{}px;'.format(sd.get(f'margin_{which}', 20)),
+        class_='book-side-margin', id=f'book-{which}-margin',
+        onclick=self.side_margin_clicked.bind(None, which),
+        oncontextmenu=self.margin_context_menu.bind(None, which),
+        onwheel=self.on_margin_wheel.bind(None, which)
+    )
     return ans
 
 
@@ -549,8 +554,9 @@ class View:
                     margin_left + margin_right + self.book_scrollbar.effective_width)
             set_css(m, width=val + 'px')
             val = min(val, 25)
-            m.firstChild.style.width = val + 'px'
-            m.firstChild.style.height = val + 'px'
+            s = m.querySelector('.arrow').style
+            s.width = val + 'px'
+            s.height = val + 'px'
         side_margin('left', margin_left), side_margin('right', margin_right)
 
     def on_iframe_ready(self, data):