diff --git a/notes/pics/bloom-filter.png b/notes/pics/bloom-filter.png
index 4d6aa70b..d8d148ff 100644
Binary files a/notes/pics/bloom-filter.png and b/notes/pics/bloom-filter.png differ
diff --git a/notes/pics/cache-aside-race.png b/notes/pics/cache-aside-race.png
index aa813432..ed18b996 100644
Binary files a/notes/pics/cache-aside-race.png and b/notes/pics/cache-aside-race.png differ
diff --git a/notes/pics/lru.png b/notes/pics/lru.png
index c5252ce2..ddaf7fe5 100644
Binary files a/notes/pics/lru.png and b/notes/pics/lru.png differ
diff --git a/tools/diagram/src/bloom-filter.svg b/tools/diagram/src/bloom-filter.svg
index 83dbc77e..55662c60 100644
--- a/tools/diagram/src/bloom-filter.svg
+++ b/tools/diagram/src/bloom-filter.svg
@@ -1,31 +1,31 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="620" height="300" viewBox="0 0 620 300">
   <style>
-    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #666; font-size: 12px; }
-    .title { font-weight: bold; font-size: 15px; fill: #777; text-anchor: middle; }
+    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #3F3F3F; font-size: 12px; }
+    .title { font-weight: bold; font-size: 15px; fill: #333; text-anchor: middle; }
     .b { font-weight: bold; }
     .c { text-anchor: middle; }
     .e { text-anchor: end; }
     .note { fill: #C0605A; }
     .ok { fill: #6A9F68; }
-    .sub { font-size: 11px; fill: #888; }
+    .sub { font-size: 11px; fill: #6E6E6E; }
     .mono { font-family: Menlo, Consolas, monospace; }
-    .arrow { stroke: #666; stroke-width: 1.3; fill: none; marker-end: url(#a); }
+    .arrow { stroke: #555; stroke-width: 1.1; fill: none; marker-end: url(#a); }
     .red { stroke: #C0605A; marker-end: url(#r); }
     .green { stroke: #6A9F68; marker-end: url(#g); }
     .dash { stroke-dasharray: 5 4; }
-    .line { stroke: #666; stroke-width: 1.3; fill: none; }
+    .line { stroke: #555; stroke-width: 1.1; fill: none; }
     .frame { fill: none; stroke: #999; stroke-width: 1; stroke-dasharray: 4 3; }
     .shadow { fill: #DADADA; }
   </style>
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-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#666" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#555"/>
     </marker>
     <marker id="r" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#C0605A" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#C0605A"/>
     </marker>
     <marker id="g" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#6A9F68" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#6A9F68"/>
     </marker>
   </defs>
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@@ -34,7 +34,7 @@
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-  <rect x="86" y="135" width="32" height="30" fill="#B1DDF0" stroke="#999"/>
+  <rect x="86" y="135" width="32" height="30" fill="#C6E4FB" stroke="#999"/>
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@@ -43,13 +43,13 @@
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   <text x="166" y="181" class="c sub">3</text>
-  <rect x="182" y="135" width="32" height="30" fill="#B1DDF0" stroke="#999"/>
+  <rect x="182" y="135" width="32" height="30" fill="#C6E4FB" stroke="#999"/>
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   <text x="230" y="181" class="c sub">5</text>
-  <rect x="246" y="135" width="32" height="30" fill="#B1DDF0" stroke="#999"/>
+  <rect x="246" y="135" width="32" height="30" fill="#C6E4FB" stroke="#999"/>
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@@ -61,7 +61,7 @@
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-  <rect x="374" y="135" width="32" height="30" fill="#B1DDF0" stroke="#999"/>
+  <rect x="374" y="135" width="32" height="30" fill="#C6E4FB" stroke="#999"/>
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   <text x="390" y="181" class="c sub">10</text>
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@@ -70,7 +70,7 @@
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   <text x="454" y="181" class="c sub">12</text>
-  <rect x="470" y="135" width="32" height="30" fill="#B1DDF0" stroke="#999"/>
+  <rect x="470" y="135" width="32" height="30" fill="#C6E4FB" stroke="#999"/>
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@@ -79,11 +79,9 @@
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-  <rect x="122" y="52" width="80" height="30" rx="6" class="shadow"/>
-  <rect x="120" y="50" width="80" height="30" rx="6" fill="#B0E3E6"/>
+  <rect x="120" y="50" width="80" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
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-  <rect x="422" y="52" width="80" height="30" rx="6" class="shadow"/>
-  <rect x="420" y="50" width="80" height="30" rx="6" fill="#B0E3E6"/>
+  <rect x="420" y="50" width="80" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
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@@ -92,11 +90,9 @@
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   <text x="30" y="70" class="b">插入</text>
-  <rect x="92" y="242" width="80" height="30" rx="6" class="shadow"/>
-  <rect x="90" y="240" width="80" height="30" rx="6" fill="#E6E6E6"/>
+  <rect x="90" y="240" width="80" height="30" rx="6" fill="#EAE9E7" stroke="#BFBEBA"/>
   <text x="130" y="259.5" class="b c">key3</text>
-  <rect x="382" y="242" width="80" height="30" rx="6" class="shadow"/>
-  <rect x="380" y="240" width="80" height="30" rx="6" fill="#E6E6E6"/>
+  <rect x="380" y="240" width="80" height="30" rx="6" fill="#EAE9E7" stroke="#BFBEBA"/>
   <text x="420" y="259.5" class="b c">key4</text>
   <line x1="130" y1="237" x2="102" y2="168" class="arrow "/>
   <line x1="130" y1="237" x2="166" y2="168" class="arrow red"/>
diff --git a/tools/diagram/src/cache-aside-race.svg b/tools/diagram/src/cache-aside-race.svg
index daaf127a..3af8f9aa 100644
--- a/tools/diagram/src/cache-aside-race.svg
+++ b/tools/diagram/src/cache-aside-race.svg
@@ -1,23 +1,23 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="520" height="322" viewBox="0 0 520 322">
   <style>
-    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #666; font-size: 13px; }
+    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #3F3F3F; font-size: 13px; }
     .head { font-weight: bold; text-anchor: middle; }
     .msg { text-anchor: middle; font-size: 12px; }
     .note { font-size: 12px; fill: #C0605A; }
     .ok { fill: #6A9F68; }
-    .title { font-weight: bold; font-size: 15px; fill: #777; text-anchor: middle; }
+    .title { font-weight: bold; font-size: 15px; fill: #333; text-anchor: middle; }
     .life { stroke: #BBB; stroke-width: 1; stroke-dasharray: 4 4; }
-    .arrow { stroke: #666; stroke-width: 1.3; fill: none; marker-end: url(#a); }
+    .arrow { stroke: #555; stroke-width: 1.1; fill: none; marker-end: url(#a); }
     .reply { stroke-dasharray: 5 4; }
     .lost { stroke: #C0605A; marker-end: url(#x); }
     .shadow { fill: #DADADA; }
   </style>
   <defs>
     <marker id="a" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#666" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#555"/>
     </marker>
     <marker id="x" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#C0605A" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#C0605A"/>
     </marker>
   </defs>
   <rect width="100%" height="100%" fill="#FFFFFF"/>
@@ -26,17 +26,13 @@
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   <line x1="325" y1="76" x2="325" y2="302" class="life"/>
   <line x1="455" y1="76" x2="455" y2="302" class="life"/>
-  <rect x="31" y="47" width="72" height="30" rx="6" class="shadow"/>
-  <rect x="29" y="45" width="72" height="30" rx="6" fill="#B0E3E6"/>
+  <rect x="29" y="45" width="72" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
   <text x="65" y="64.5" class="head">写请求</text>
-  <rect x="161" y="47" width="72" height="30" rx="6" class="shadow"/>
-  <rect x="159" y="45" width="72" height="30" rx="6" fill="#B1DDF0"/>
+  <rect x="159" y="45" width="72" height="30" rx="6" fill="#C6E4FB" stroke="#7FB2D6"/>
   <text x="195" y="64.5" class="head">缓存</text>
-  <rect x="291" y="47" width="72" height="30" rx="6" class="shadow"/>
-  <rect x="289" y="45" width="72" height="30" rx="6" fill="#B1DDF0"/>
+  <rect x="289" y="45" width="72" height="30" rx="6" fill="#C6E4FB" stroke="#7FB2D6"/>
   <text x="325" y="64.5" class="head">数据库</text>
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-  <rect x="419" y="45" width="72" height="30" rx="6" fill="#B0E3E6"/>
+  <rect x="419" y="45" width="72" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
   <text x="455" y="64.5" class="head">读请求</text>
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   <text x="130" y="94" class="msg">① 删除缓存</text>
diff --git a/tools/diagram/src/lru.svg b/tools/diagram/src/lru.svg
index 2fcde3cb..bfa660fe 100644
--- a/tools/diagram/src/lru.svg
+++ b/tools/diagram/src/lru.svg
@@ -1,50 +1,45 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="620" height="270" viewBox="0 0 620 270">
   <style>
-    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #666; font-size: 12px; }
-    .title { font-weight: bold; font-size: 15px; fill: #777; text-anchor: middle; }
+    text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #3F3F3F; font-size: 12px; }
+    .title { font-weight: bold; font-size: 15px; fill: #333; text-anchor: middle; }
     .b { font-weight: bold; }
     .c { text-anchor: middle; }
     .e { text-anchor: end; }
     .note { fill: #C0605A; }
     .ok { fill: #6A9F68; }
-    .sub { font-size: 11px; fill: #888; }
+    .sub { font-size: 11px; fill: #6E6E6E; }
     .mono { font-family: Menlo, Consolas, monospace; }
-    .arrow { stroke: #666; stroke-width: 1.3; fill: none; marker-end: url(#a); }
+    .arrow { stroke: #555; stroke-width: 1.1; fill: none; marker-end: url(#a); }
     .red { stroke: #C0605A; marker-end: url(#r); }
     .green { stroke: #6A9F68; marker-end: url(#g); }
     .dash { stroke-dasharray: 5 4; }
-    .line { stroke: #666; stroke-width: 1.3; fill: none; }
+    .line { stroke: #555; stroke-width: 1.1; fill: none; }
     .frame { fill: none; stroke: #999; stroke-width: 1; stroke-dasharray: 4 3; }
     .shadow { fill: #DADADA; }
   </style>
   <defs>
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-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#666" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#555"/>
     </marker>
     <marker id="r" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#C0605A" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#C0605A"/>
     </marker>
     <marker id="g" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse">
-      <path d="M1,1 L9,5 L1,9" fill="none" stroke="#6A9F68" stroke-width="1.6"/>
+      <path d="M1,1.5 L9.5,5 L1,8.5 z" fill="#6A9F68"/>
     </marker>
   </defs>
   <rect width="100%" height="100%" fill="#FFFFFF"/>
 
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-  <rect x="32" y="159" width="80" height="36" rx="6" class="shadow"/>
-  <rect x="30" y="157" width="80" height="36" rx="6" fill="#E6E6E6"/>
+  <rect x="30" y="157" width="80" height="36" rx="6" fill="#EAE9E7" stroke="#BFBEBA"/>
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+  <rect x="150" y="157" width="80" height="36" rx="6" fill="#C6E4FB" stroke="#7FB2D6"/>
   <text x="190" y="179.5" class="c b mono">k2</text>
-  <rect x="272" y="159" width="80" height="36" rx="6" class="shadow"/>
-  <rect x="270" y="157" width="80" height="36" rx="6" fill="#B1DDF0"/>
+  <rect x="270" y="157" width="80" height="36" rx="6" fill="#C6E4FB" stroke="#7FB2D6"/>
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-  <rect x="392" y="159" width="80" height="36" rx="6" class="shadow"/>
-  <rect x="390" y="157" width="80" height="36" rx="6" fill="#B1DDF0"/>
+  <rect x="390" y="157" width="80" height="36" rx="6" fill="#C6E4FB" stroke="#7FB2D6"/>
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-  <rect x="510" y="157" width="80" height="36" rx="6" fill="#E6E6E6"/>
+  <rect x="510" y="157" width="80" height="36" rx="6" fill="#EAE9E7" stroke="#BFBEBA"/>
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@@ -56,13 +51,13 @@
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   <text x="142" y="70" class="b">HashMap</text>
-  <rect x="160" y="72" width="60" height="30" rx="6" fill="#B0E3E6"/>
+  <rect x="160" y="72" width="60" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
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+  <rect x="280" y="72" width="60" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
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+  <rect x="400" y="72" width="60" height="30" rx="6" fill="#C6ECE9" stroke="#7DBCB7"/>
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