diff --git a/src/css/custom.scss b/src/css/custom.scss
index 1bd5b331..5dd4f8c1 100644
--- a/src/css/custom.scss
+++ b/src/css/custom.scss
@@ -5,6 +5,8 @@
  * work well for content-centric websites.
  */
 
+@import url('https://fonts.googleapis.com/css2?family=Open+Sans&display=swap');
+
 /* You can override the default Infima variables here. */
 :root {
   --ifm-color-primary: #ec3783;
@@ -14,7 +16,20 @@
   --ifm-color-primary-light: #ef5293;
   --ifm-color-primary-lighter: #f05f9c;
   --ifm-color-primary-lightest: #f487b4;
-  --ifm-code-font-size: 95%;
+  
+  --ifm-code-font-size: 90%;
+  --ifm-font-family-base: 'Open Sans';
+}
+
+.menu__link--sublist:after {
+  content: '';
+  min-width: 1.25rem;
+  background: var(--ifm-menu-link-sublist-icon) 50% / 1.25rem 1.25rem;
+  filter: var(--ifm-menu-link-sublist-icon-filter);
+  height: 1.25rem;
+  transform: rotate(180deg);
+  width: 1.25rem;
+  transition: transform var(--ifm-transition-fast) linear;
 }
 
 .docusaurus-highlight-code-line {
diff --git a/static/img/favicon.ico b/static/img/favicon.ico
deleted file mode 100644
index c01d54bc..00000000
Binary files a/static/img/favicon.ico and /dev/null differ
diff --git a/static/img/favicon.svg b/static/img/favicon.svg
index 495752a2..3ee727f6 100644
--- a/static/img/favicon.svg
+++ b/static/img/favicon.svg
@@ -1,15 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
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-    <title>favicon</title>
-    <defs>
-        <linearGradient x1="100%" y1="100%" x2="0%" y2="0%" id="linearGradient-1">
-            <stop stop-color="#FF0050" offset="0%"></stop>
-            <stop stop-color="#7000FF" offset="71.4447846%"></stop>
-            <stop stop-color="#0027FF" offset="100%"></stop>
-        </linearGradient>
-    </defs>
-    <g id="favicon" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <circle id="椭圆形" fill="url(#linearGradient-1)" fill-rule="nonzero" cx="64" cy="64" r="64"></circle>
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+<svg width="256px" height="256px" viewBox="0 0 256 256" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>Crab-Background</title>
+    <g id="Crab-Background" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <rect id="矩形" fill="#512DBC" x="0" y="0" width="256" height="256"></rect>
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diff --git a/static/img/logo.svg b/static/img/logo.svg
deleted file mode 100644
index 9db6d0d0..00000000
--- a/static/img/logo.svg
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