diff --git a/src/css/custom.css b/src/css/custom.css
index 22e7960d826bace8abb777c6bee2ec04666168a5..49cd975ad7e960023747972d377d1d57b8ed7392 100644
--- a/src/css/custom.css
+++ b/src/css/custom.css
@@ -22,6 +22,7 @@
   --ifm-navbar-second-background-color: rgba(248, 250, 252, 1);
   --ifm-navbar-button-border-color: rgba(226, 232, 240, 1);
   --ifm-navbar-button-color: rgba(15, 23, 41, 1);
+  --ifm-font-family-base: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
 }
 
 /* For readability concerns, you should choose a lighter palette in dark mode. */
@@ -261,3 +262,17 @@ div[id^='headlessui-disclosure-panel'] tr td.relative:nth-child(2) {
     color: var(--ifm-menu-color);
   }
 }
+
+/* 修复左侧边栏样式，使其固定不滚动 */
+.t-doc__sidebar {
+  max-height: calc(100dvh - (var(--ifm-navbar-height) * 2)) !important;
+  top: calc(var(--ifm-navbar-height) * 2) !important;
+}
+
+.theme-doc-sidebar-container {
+  margin-top: calc(-1* var(--ifm-navbar-height) * 2) !important;
+}
+
+.theme-doc-sidebar-container > div > div {
+  padding-top: calc(var(--ifm-navbar-height) * 2) !important;
+}
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