diff --git a/book.toml b/book.toml
index bfbf1cd..9e3d9f5 100644
--- a/book.toml
+++ b/book.toml
@@ -26,3 +26,5 @@ assets_version = "2.0.0" # do not edit: managed by `mdbook-admonish install`
 [output.html]
 additional-css = ["./theme/catppuccin.css", "./theme/catppuccin-highlight.css", "././mdbook-admonish.css"]
 additional-js = ["mermaid.min.js", "mermaid-init.js"]
+preferred-dark-theme="mocha"
+preferred-light-theme="latte"
diff --git a/theme/index.hbs b/theme/index.hbs
index 69ad430..cf1d678 100644
--- a/theme/index.hbs
+++ b/theme/index.hbs
@@ -122,11 +122,6 @@
                             <i class="fa fa-paint-brush"></i>
                         </button>
                         <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
-                            <li role="none"><button role="menuitem" class="theme" id="light">{{ theme_option "Light" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="rust">{{ theme_option "Rust" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="coal">{{ theme_option "Coal" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="navy">{{ theme_option "Navy" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="ayu">{{ theme_option "Ayu" }}</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="latte">{{ theme_option "Latte" }}</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="frappe">{{ theme_option "Frappé" }}</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="macchiato">{{ theme_option "Macchiato" }}</button></li>