diff --git a/README.md b/README.md
index 6c024aa..afa8fbc 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# <img src="./doc/svg/nasal_transparent.svg" height="50px"/> __Nasal - Modern Interpreter__
+# <img src="./doc/svg/nasal_transparent.svg" height="40px"/> __Nasal - Modern Interpreter__
 
 <img src="./doc/pic/header.png" style="width:600px"></img>
 
@@ -71,31 +71,21 @@ please wait or just compile it by yourself, a Cmake file is given for Visual Stu
 * [linux-nightly-build](https://github.com/ValKmjolnir/Nasal-Interpreter/releases/tag/next_linux_x86_64)
 * windows-nightly-build: [WIP]
 
-## __Compile__
-
-![g++](https://img.shields.io/badge/GNU-g++-A42E2B?style=flat-square&logo=GNU)
-![clang++](https://img.shields.io/badge/LLVM-clang++-262D3A?style=flat-square&logo=LLVM)
-![vs](https://img.shields.io/badge/Visual_Studio-MSVC-5C2D91?style=flat-square&logo=visualstudio)
+## __Compile__ ![g++](https://img.shields.io/badge/GNU-g++-A42E2B?style=flat-square&logo=GNU) ![clang++](https://img.shields.io/badge/LLVM-clang++-262D3A?style=flat-square&logo=LLVM) ![vs](https://img.shields.io/badge/Visual_Studio-MSVC-5C2D91?style=flat-square&logo=visualstudio)
 
 Better download the latest update source of the interpreter and build it! It's quite easy to build this interpreter, what you need are only two things: C++ compiler and the `make`. There is no third-party library used in this project.
 
-### __Windows (MinGW-w64)__
-
-![windows](https://img.shields.io/badge/Microsoft-Windows-green?style=flat-square&logo=windows)
+### __Windows (MinGW-w64)__ ![windows](https://img.shields.io/badge/Microsoft-Windows-green?style=flat-square&logo=windows)
 
 Make sure thread model is `posix thread model`, otherwise no thread library exists.
 
 > mingw32-make nasal.exe -j4
 
-### __Windows (Visual Studio)__
-
-![windows](https://img.shields.io/badge/Microsoft-Windows-green?style=flat-square&logo=windows)
+### __Windows (Visual Studio)__ ![windows](https://img.shields.io/badge/Microsoft-Windows-green?style=flat-square&logo=windows)
 
 There is a [__CMakelists.txt__](./CMakeLists.txt) to create project.
 
-### __Linux / macOS / Unix__
-
-![linux](https://img.shields.io/badge/GNU-Linux-green?style=flat-square&logo=GNU) ![macOS](https://img.shields.io/badge/Apple%20Inc.-MacOS-green?style=flat-square&logo=apple)
+### __Linux / macOS / Unix__ ![linux](https://img.shields.io/badge/GNU-Linux-green?style=flat-square&logo=GNU) ![macOS](https://img.shields.io/badge/Apple%20Inc.-MacOS-green?style=flat-square&logo=apple)
 
 > make -j
 
diff --git a/doc/README_zh.md b/doc/README_zh.md
index 6970633..dc5c1c1 100644
--- a/doc/README_zh.md
+++ b/doc/README_zh.md
@@ -1,4 +1,4 @@
-# <img src="./svg/nasal_transparent.svg" height="50px"/> __Nasal - Modern Interpreter__
+# <img src="./svg/nasal_transparent.svg" height="40px"/> __Nasal - Modern Interpreter__
 
 <img src="../doc/pic/header.png" style="width:600px"></img>
 
diff --git a/doc/svg/nasal.svg b/doc/svg/nasal.svg
index 389651a..b46607d 100644
--- a/doc/svg/nasal.svg
+++ b/doc/svg/nasal.svg
@@ -4,15 +4,16 @@
     <g fill="#1d2c4e">
       <!-- left side -->
       <path d="M 10 10 L 10 80 L 20 90 L 25 90 L 25 20 L 15 10 Z"/>
-      <path d="M 10 10 L 85 85 L 85 90 L 70 90 L 10 30 Z"/>
+      <path d="M 10 10 L 84 84 L 84 90 L 70 90 L 10 30 Z"/>
       <!-- right-up corner -->
       <path d="M 30 10 L 70 50 L 70 55 L 30 15 Z" />
-      <path d="M 30 10 L 40 10 L 70 40 L 70 55 Z" />
-      <path d="M 30 10 L 80 10 L 80 15 L 30 15 Z" />
-      <path d="M 72 10 L 72 55 L 65 55 L 65 10 Z" />
-      <path d="M 55 10 L 70 25 L 70 35 L 45 10 Z"/>
-      <path d="M 70 55 L 65 55 L 55 45 L 55 35 Z"/>
-      <path d="M 70 10 L 80 10 L 80 15 L 70 25 Z"/>
-      </g>
+      <path d="M 30 10 L 43 10 L 70 37 L 70 55 Z" />
+      <path d="M 68 10 L 68 55 L 83 55 L 83 18 L 75 10 Z" />
+      <path d="M 70 50 L 70 55 L 65 55 L 55 45 L 55 35 Z"/>
+    </g>
+    <g fill="#97363a">
+      <!-- right-down corner -->
+      <path d="M 83 60 L 83 75 L 68 60 Z" />
+    </g>
   </g>
 </svg>
\ No newline at end of file
diff --git a/doc/svg/nasal_transparent.svg b/doc/svg/nasal_transparent.svg
index e26e972..e17c04f 100644
--- a/doc/svg/nasal_transparent.svg
+++ b/doc/svg/nasal_transparent.svg
@@ -4,15 +4,16 @@
     <g fill="#6e93e9">
       <!-- left side -->
       <path d="M 10 10 L 10 80 L 20 90 L 25 90 L 25 20 L 15 10 Z"/>
-      <path d="M 10 10 L 85 85 L 85 90 L 70 90 L 10 30 Z"/>
+      <path d="M 10 10 L 84 84 L 84 90 L 70 90 L 10 30 Z"/>
       <!-- right-up corner -->
       <path d="M 30 10 L 70 50 L 70 55 L 30 15 Z" />
-      <path d="M 30 10 L 40 10 L 70 40 L 70 55 Z" />
-      <path d="M 30 10 L 80 10 L 80 15 L 30 15 Z" />
-      <path d="M 72 10 L 72 55 L 65 55 L 65 10 Z" />
-      <path d="M 55 10 L 70 25 L 70 35 L 45 10 Z"/>
-      <path d="M 70 55 L 65 55 L 55 45 L 55 35 Z"/>
-      <path d="M 70 10 L 80 10 L 80 15 L 70 25 Z"/>
-      </g>
+      <path d="M 30 10 L 43 10 L 70 37 L 70 55 Z" />
+      <path d="M 68 10 L 68 55 L 83 55 L 83 18 L 75 10 Z" />
+      <path d="M 70 50 L 70 55 L 65 55 L 55 45 L 55 35 Z"/>
+    </g>
+    <g fill="#97363a">
+      <!-- right-down corner -->
+      <path d="M 83 60 L 83 75 L 68 60 Z" />
+    </g>
   </g>
 </svg>
\ No newline at end of file