diff --git a/docs/css/style.css b/docs/css/style.css
index cec2832..610bc6f 100644
--- a/docs/css/style.css
+++ b/docs/css/style.css
@@ -181,8 +181,11 @@ main {
   background: hsla(0, 0%, 53%, 0.1);
 }
 
+.close .sidebar {
+  transform: translateX(-300px);
+}
+
 .sidebar-toggle {
-  background-color: transparent;
   background-color: var(--bg-color);
   border: 0;
   outline: none;
@@ -192,9 +195,9 @@ main {
   position: absolute;
   text-align: center;
   transition: opacity 0.3s;
-  width: 30px;
   width: 284px;
   z-index: 4;
+  cursor: pointer;
 }
 
 .sidebar-toggle .sidebar-toggle-button:hover {
diff --git a/static/style.min.css b/static/style.min.css
index e345f7e..3077472 100644
--- a/static/style.min.css
+++ b/static/style.min.css
@@ -1 +1 @@
-@import url("https://rsms.me/inter/inter-ui.css");:root{--base:#f5f4f4;--black:rgba(18,16,12,.70196);--gray0:#f9f9f9;--gray1:#ededee;--gray2:#e0e1e1;--gray3:#d2d3d4;--gray4:#c3c4c5;--gray5:#b2b3b5;--gray6:#9fa0a2;--gray7:#88898c;--gray8:#6b6c70;--gray9:#3d3f44;--gray10:#000;--primary-color:var(--gray9);--secondary-color:var(--gray10);--accent-color:#fc6568;--text-color:#121102;--text-bold-color:var(--gray10);--sidebar-color:var(--primary-color);--sidebar-active-color:var(--secondary-color);--sidebar-border-color:#5f6368;--bg-color:var(--base);--serif-font:"IBM Plex Sans",sans-serif;--sans-serif-font:"IBM Plex Sans",sans-serif;--code-font:Nitti,"Microsoft YaHei","Roboto Mono",微软雅黑,monospace;--codebox-border-color:var(--text-color);--codebox-color:var(--text-color);--codebox-token-var-color:var(--text-color);--codebox-bg:var(--bg-color)}::selection{background:#f9e4ac}::-moz-selection{background:#f9e4ac}*{-webkit-font-smoothing:antialiased;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;box-sizing:border-box}.progress{background-color:var(--primary-color);height:2px;left:0;position:fixed;right:0;top:0;transition:width .2s,opacity .4s;width:0;z-index:4}body,html{height:100%}body{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;color:var(--text-color);font-family:var(--sans-serif-font);font-size:16px;letter-spacing:0;margin:0;overflow-x:hidden}img{max-width:100%}.github-corner{border-bottom:0;position:fixed;right:0;text-decoration:none;top:0;z-index:1}.github-corner svg{color:#fff;fill:var(--accent-color);height:80px;width:80px}.github-corner:hover .octo-arm{animation:a .56s ease-in-out}main{display:block;position:relative;width:100vw;height:100%;z-index:0}.anchor{display:inline-block;text-decoration:none;transition:all .3s}.anchor span{color:var(--secondary-color)}.anchor:hover{text-decoration:underline}.sidebar{font-family:var(--serif-font);overflow-y:auto;padding:40px 0 0;top:0;bottom:0;left:0;position:absolute;transition:transform .25s ease-out;width:300px;z-index:2}.sidebar .sidebar-nav{line-height:2em;padding-bottom:40px}.sidebar ul{margin:0;padding:0}.sidebar ul,.sidebar ul li{list-style:none}.sidebar ul li a{border-bottom:none;display:block}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-thumb{background:transparent;border-radius:4px}.sidebar:hover::-webkit-scrollbar-thumb{background:hsla(0,0%,53%,.4)}.sidebar:hover::-webkit-scrollbar-track{background:hsla(0,0%,53%,.1)}.sidebar-toggle{background-color:transparent;background-color:var(--bg-color);border:0;outline:none;padding:10px;bottom:0;left:0;position:absolute;text-align:center;transition:opacity .3s;width:30px;width:284px;z-index:3}.sidebar-toggle .sidebar-toggle-button:hover{opacity:.4}.sidebar-toggle span{background-color:var(--primary-color);display:block;margin-bottom:4px;width:16px;height:2px}body.sticky .sidebar,body.sticky .sidebar-toggle{position:fixed}.content{padding-top:60px;top:0;right:0;bottom:0;left:300px;position:absolute;transition:left .25s ease}.markdown-section{margin:0 auto;max-width:800px;padding:30px 15px 40px;position:relative}.markdown-section>*{box-sizing:border-box;font-size:inherit}.markdown-section>:first-child{margin-top:0!important}.markdown-section p.tip{background-color:#f8f8f8;border-bottom-right-radius:2px;border-left:4px solid var(--accent-color);border-top-right-radius:2px;margin:2em 0;padding:12px 24px 12px 30px;position:relative}.markdown-section p.tip:before{background-color:var(--accent-color);border-radius:100%;color:#fff;content:"!";font-family:Dosis,Source Sans Pro,Helvetica Neue,Arial,sans-serif;font-size:14px;font-weight:700;left:-12px;line-height:20px;position:absolute;width:20px;height:20px;text-align:center;top:14px}@media print{.github-corner,.sidebar,.sidebar-toggle{display:none}}@media screen and (max-width:768px){.github-corner,.sidebar,.sidebar-toggle{position:fixed}main{height:auto;overflow-x:hidden}.sidebar{left:-300px;transition:transform .25s ease-out}.content{left:0;max-width:100vw;position:static;padding-top:20px;transition:transform .25s ease}.github-corner{transition:transform .25s ease-out}.sidebar-toggle{background-color:transparent;width:auto}.github-corner .octo-arm{animation:a .56s ease-in-out}.github-corner:hover .octo-arm{animation:none}}@keyframes a{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}.sidebar,body{background-color:var(--bg-color);color:var(--primary-color)}.sidebar{color:#364149}.sidebar li{margin:6px 0 6px 15px}.sidebar ul li a{color:var(--sidebar-color);font-size:14px;font-weight:400;overflow:hidden;text-decoration:none;text-overflow:ellipsis;white-space:nowrap}.sidebar ul li a:hover{text-decoration:underline}.sidebar ul li.active>a{border-right:2px solid;color:var(--sidebar-active-color);font-weight:700}.markdown-section h1,.markdown-section h2,.markdown-section h3,.markdown-section h4,.markdown-section h5{font-family:var(--serif-font)}.markdown-section strong{font-family:var(--sans-serif-font);color:var(--text-bold-color)}.markdown-section a{color:var(--primary-color);text-decoration:none;font-weight:600}.markdown-section li a,.markdown-section p a{color:var(--accent-color);text-decoration:underline;text-underline-offset:1px}.markdown-section li a:hover,.markdown-section p a:hover{opacity:.8}.markdown-section h1{font-size:2rem;margin:4rem 0 1rem}.markdown-section h2{font-size:1.75rem;margin:3.5rem 0 1rem}.markdown-section h3{font-size:1.5rem;margin:3rem 0 1rem}.markdown-section h4{font-size:1.25rem;margin:2.5rem 0 1rem}.markdown-section h5{font-size:1rem}.markdown-section p{margin:1.2em 0}.markdown-section p,.markdown-section ul{line-height:1.8rem;word-spacing:.05rem}.markdown-section ul li{margin-bottom:10px}.markdown-section ul{padding-left:2rem}.markdown-section blockquote{border-left:4px solid var(--primary-color);margin:2em 0;padding-left:20px}.markdown-section blockquote p{font-weight:400;margin-left:0;padding:12px 0}.markdown-section li code,.markdown-section p code{color:var(--codebox-token-var-color);border:1px solid var(--codebox-border-color);background:var(--codebox-bg);font-size:.75rem;padding:3px 10px;border-radius:3px;white-space:nowrap}.markdown-section code{border-radius:2px;color:var(--codebox-token-var-color);font-size:.8rem;margin:0 2px;padding:3px 5px;white-space:pre-wrap}.markdown-section pre{border-radius:5px;background-color:var(--codebox-bg);border:1px solid var(--codebox-border-color)}.markdown-section code,.markdown-section pre{font-family:var(--code-font)}.markdown-section pre{line-height:1.5rem;margin:1.2em 0;overflow:auto;padding:0 .7rem;position:relative;word-wrap:normal}.markdown-section pre,.markdown-section pre>code{-moz-osx-font-smoothing:initial;-webkit-font-smoothing:initial}.markdown-section pre>code{background-color:var(--codebox-bg);border-radius:2px;color:var(--codebox-token-var-color);display:block;font-family:var(--code-font);font-size:.8rem;line-height:inherit;margin:0 2px;max-width:inherit;overflow:inherit;padding:1.25em 5px;white-space:inherit}.markdown-section code:after,.markdown-section code:before{letter-spacing:.8px;letter-spacing:.05rem}.token.class-name,.token.function,.token.number{color:#d46e00}.token.string{color:#d40066}.token.constant,.token.keyword{color:#e00400}.token.comment{color:var(--gray7)}pre:after{color:#ccc;content:attr(data-lang);font-size:.6rem;font-weight:600;height:15px;line-height:15px;padding:5px 10px 0;position:absolute;right:0;text-align:right;top:0}.sidebar ul ul{margin-left:15px}
\ No newline at end of file
+@import url("https://rsms.me/inter/inter-ui.css");:root{--base:#f5f4f4;--black:rgba(18,16,12,.70196);--gray0:#f9f9f9;--gray1:#ededee;--gray2:#e0e1e1;--gray3:#d2d3d4;--gray4:#c3c4c5;--gray5:#b2b3b5;--gray6:#9fa0a2;--gray7:#88898c;--gray8:#6b6c70;--gray9:#3d3f44;--gray10:#000;--primary-color:var(--gray9);--secondary-color:var(--gray10);--accent-color:#fc6568;--text-color:#121102;--text-bold-color:var(--gray10);--sidebar-color:var(--primary-color);--sidebar-active-color:var(--secondary-color);--sidebar-border-color:#5f6368;--bg-color:var(--base);--serif-font:"IBM Plex Sans",sans-serif;--sans-serif-font:"IBM Plex Sans",sans-serif;--code-font:Nitti,"Microsoft YaHei","Roboto Mono",微软雅黑,monospace;--codebox-border-color:var(--text-color);--codebox-color:var(--text-color);--codebox-token-var-color:var(--text-color);--codebox-bg:var(--bg-color)}::selection{background:#f9e4ac}::-moz-selection{background:#f9e4ac}*{-webkit-font-smoothing:antialiased;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;box-sizing:border-box}.progress{background-color:var(--primary-color);height:2px;left:0;position:fixed;right:0;top:0;transition:width .2s,opacity .4s;width:0;z-index:4}body,html{height:100%}body{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;color:var(--text-color);font-family:var(--sans-serif-font);font-size:16px;letter-spacing:0;margin:0;overflow-x:hidden}img{max-width:100%}.github-corner{border-bottom:0;position:fixed;right:0;text-decoration:none;top:0;z-index:1}.github-corner svg{color:#fff;fill:var(--accent-color);height:80px;width:80px}.github-corner:hover .octo-arm{animation:a .56s ease-in-out}main{display:block;position:relative;width:100vw;height:100%;z-index:0}.anchor{display:inline-block;text-decoration:none;transition:all .3s}.anchor span{color:var(--secondary-color)}.anchor:hover{text-decoration:underline}.sidebar{font-family:var(--serif-font);overflow-y:auto;padding:40px 0 0;top:0;bottom:0;left:0;position:absolute;transition:transform .25s ease-out;width:300px;z-index:2}.sidebar .sidebar-nav{line-height:2em;padding-bottom:40px}.sidebar ul{margin:0;padding:0}.sidebar ul,.sidebar ul li{list-style:none}.sidebar ul li a{border-bottom:none;display:block}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-thumb{background:transparent;border-radius:4px}.sidebar:hover::-webkit-scrollbar-thumb{background:hsla(0,0%,53%,.4)}.sidebar:hover::-webkit-scrollbar-track{background:hsla(0,0%,53%,.1)}.close .sidebar{transform:translateX(-300px)}.sidebar-toggle{background-color:var(--bg-color);border:0;outline:none;padding:10px;bottom:0;left:0;position:absolute;text-align:center;transition:opacity .3s;width:284px;z-index:3;cursor:pointer}.sidebar-toggle .sidebar-toggle-button:hover{opacity:.4}.sidebar-toggle span{background-color:var(--primary-color);display:block;margin-bottom:4px;width:16px;height:2px}body.sticky .sidebar,body.sticky .sidebar-toggle{position:fixed}.content{padding-top:60px;top:0;right:0;bottom:0;left:300px;position:absolute;transition:left .25s ease}.markdown-section{margin:0 auto;max-width:800px;padding:30px 15px 40px;position:relative}.markdown-section>*{box-sizing:border-box;font-size:inherit}.markdown-section>:first-child{margin-top:0!important}.markdown-section p.tip{background-color:#f8f8f8;border-bottom-right-radius:2px;border-left:4px solid var(--accent-color);border-top-right-radius:2px;margin:2em 0;padding:12px 24px 12px 30px;position:relative}.markdown-section p.tip:before{background-color:var(--accent-color);border-radius:100%;color:#fff;content:"!";font-family:Dosis,Source Sans Pro,Helvetica Neue,Arial,sans-serif;font-size:14px;font-weight:700;left:-12px;line-height:20px;position:absolute;width:20px;height:20px;text-align:center;top:14px}@media print{.github-corner,.sidebar,.sidebar-toggle{display:none}}@media screen and (max-width:768px){.github-corner,.sidebar,.sidebar-toggle{position:fixed}main{height:auto;overflow-x:hidden}.sidebar{left:-300px;transition:transform .25s ease-out}.content{left:0;max-width:100vw;position:static;padding-top:20px;transition:transform .25s ease}.github-corner{transition:transform .25s ease-out}.sidebar-toggle{background-color:transparent;width:auto}.github-corner .octo-arm{animation:a .56s ease-in-out}.github-corner:hover .octo-arm{animation:none}}@keyframes a{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}.sidebar,body{background-color:var(--bg-color);color:var(--primary-color)}.sidebar{color:#364149}.sidebar li{margin:6px 0 6px 15px}.sidebar ul li a{color:var(--sidebar-color);font-size:14px;font-weight:400;overflow:hidden;text-decoration:none;text-overflow:ellipsis;white-space:nowrap}.sidebar ul li a:hover{text-decoration:underline}.sidebar ul li.active>a{border-right:2px solid;color:var(--sidebar-active-color);font-weight:700}.markdown-section h1,.markdown-section h2,.markdown-section h3,.markdown-section h4,.markdown-section h5{font-family:var(--serif-font)}.markdown-section strong{font-family:var(--sans-serif-font);color:var(--text-bold-color)}.markdown-section a{color:var(--primary-color);text-decoration:none;font-weight:600}.markdown-section li a,.markdown-section p a{color:var(--accent-color);text-decoration:underline;text-underline-offset:1px}.markdown-section li a:hover,.markdown-section p a:hover{opacity:.8}.markdown-section h1{font-size:2rem;margin:4rem 0 1rem}.markdown-section h2{font-size:1.75rem;margin:3.5rem 0 1rem}.markdown-section h3{font-size:1.5rem;margin:3rem 0 1rem}.markdown-section h4{font-size:1.25rem;margin:2.5rem 0 1rem}.markdown-section h5{font-size:1rem}.markdown-section p{margin:1.2em 0}.markdown-section p,.markdown-section ul{line-height:1.8rem;word-spacing:.05rem}.markdown-section ul li{margin-bottom:10px}.markdown-section ul{padding-left:2rem}.markdown-section blockquote{border-left:4px solid var(--primary-color);margin:2em 0;padding-left:20px}.markdown-section blockquote p{font-weight:400;margin-left:0;padding:12px 0}.markdown-section li code,.markdown-section p code{color:var(--codebox-token-var-color);border:1px solid var(--codebox-border-color);background:var(--codebox-bg);font-size:.75rem;padding:3px 10px;border-radius:3px;white-space:nowrap}.markdown-section code{border-radius:2px;color:var(--codebox-token-var-color);font-size:.8rem;margin:0 2px;padding:3px 5px;white-space:pre-wrap}.markdown-section pre{border-radius:5px;background-color:var(--codebox-bg);border:1px solid var(--codebox-border-color)}.markdown-section code,.markdown-section pre{font-family:var(--code-font)}.markdown-section pre{line-height:1.5rem;margin:1.2em 0;overflow:auto;padding:0 .7rem;position:relative;word-wrap:normal}.markdown-section pre,.markdown-section pre>code{-moz-osx-font-smoothing:initial;-webkit-font-smoothing:initial}.markdown-section pre>code{background-color:var(--codebox-bg);border-radius:2px;color:var(--codebox-token-var-color);display:block;font-family:var(--code-font);font-size:.8rem;line-height:inherit;margin:0 2px;max-width:inherit;overflow:inherit;padding:1.25em 5px;white-space:inherit}.markdown-section code:after,.markdown-section code:before{letter-spacing:.8px;letter-spacing:.05rem}.token.class-name,.token.function,.token.number{color:#d46e00}.token.string{color:#d40066}.token.constant,.token.keyword{color:#e00400}.token.comment{color:var(--gray7)}pre:after{color:#ccc;content:attr(data-lang);font-size:.6rem;font-weight:600;height:15px;line-height:15px;padding:5px 10px 0;position:absolute;right:0;text-align:right;top:0}.sidebar ul ul{margin-left:15px}
\ No newline at end of file