diff --git a/app/src/index.css b/app/src/index.css
index 5c428ab..d644e3b 100644
--- a/app/src/index.css
+++ b/app/src/index.css
@@ -6,7 +6,7 @@
   --color-fg: #bfbdb6;
   --color-instruction: #ffb454;
   --color-special: #e6b673;
-  --color-comment: rgba(172, 182, 191, 0.549);
+  --color-comment: #acb6bf8c;
   --color-constant: #d2a6ff;
   --color-dots: #f07178;
   --color-hex: #95e6cb;
@@ -14,6 +14,38 @@
   --color-focus: #d2a6ff;
 }
 
+:root[theme="light"] {
+  --color-panel: #fa8d3e;
+  --color-jump: #6cbf43;
+  --color-entity: #399ee6;
+  --color-bg: #fcfcfc;
+  --color-fg: #5c6166;
+  --color-instruction: #f2ae49;
+  --color-special: #e6ba7e;
+  --color-comment: #787b8099;
+  --color-constant: #a37acc;
+  --color-dots: #f07171;
+  --color-hex: #4cbf99;
+
+  --color-focus: #a37acc;
+}
+
+:root[theme="mirage"] {
+  --color-panel: #ffad66;
+  --color-jump: #87d96c;
+  --color-entity: #73d0ff;
+  --color-bg: #242936;
+  --color-fg: #cccac2;
+  --color-instruction: #ffd173;
+  --color-special: #ffdfb3;
+  --color-comment: #b8cfe680;
+  --color-constant: #dfbfff;
+  --color-dots: #f28779;
+  --color-hex: #95e6cb;
+
+  --color-focus: #dfbfff;
+}
+
 body {
   margin: 0;
   font-family: "JetBrains Mono", monospace;
@@ -35,9 +67,9 @@ pre {
 
 input[type="number"]::-webkit-outer-spin-button,
 input[type="number"]::-webkit-inner-spin-button {
-    -webkit-appearance: none;
-    margin: 0;
+  -webkit-appearance: none;
+  margin: 0;
 }
 input[type="number"] {
-    -moz-appearance: textfield;
+  -moz-appearance: textfield;
 }
diff --git a/app/src/ui/App.tsx b/app/src/ui/App.tsx
index 3d08f4d..46034cf 100644
--- a/app/src/ui/App.tsx
+++ b/app/src/ui/App.tsx
@@ -78,6 +78,11 @@ const App = () => {
     };
   }, []);
 
+  useEffect(() => {
+    let theme = localStorage.getItem("theme") ?? "dark";
+    document.documentElement.setAttribute("theme", theme);
+  }, []);
+
   useEffect(() => {
     if (edit) {
       ref.current?.setSelectionRange(0, 0);
@@ -87,6 +92,27 @@ const App = () => {
     }
   }, [edit]);
 
+  const changeTheme = () => {
+    const currentTheme =
+      document.documentElement.getAttribute("theme") ?? "dark";
+    let nextTheme;
+    switch (currentTheme) {
+      case "dark":
+        nextTheme = "mirage";
+        break;
+      case "mirage":
+        nextTheme = "light";
+        break;
+      case "light":
+        nextTheme = "dark";
+        break;
+      default:
+        nextTheme = "dark";
+    }
+    document.documentElement.setAttribute("theme", nextTheme);
+    localStorage.setItem("theme", nextTheme);
+  };
+
   return (
     <div className="app">
       <div className="left">
@@ -143,6 +169,9 @@ const App = () => {
               EDIT DUMP
             </button>
           </div>
+          <div className="tool">
+            <button onClick={changeTheme}>THEME</button>
+          </div>
           <div className="tool">
             <button
               className={aboutOpened ? "selected" : ""}