diff --git a/web/frontend/package-lock.json b/web/frontend/package-lock.json
index 5a66f8e..08101dc 100644
--- a/web/frontend/package-lock.json
+++ b/web/frontend/package-lock.json
@@ -28,6 +28,7 @@
         "papaparse": "^5.5.2",
         "react": "^19.1.0",
         "react-dom": "^19.1.0",
+        "react-router": "^7.9.5",
         "react-scripts": "^5.0.1",
         "tabulator-tables": "^6.3.1",
         "typescript": "^4.9.5",
@@ -14181,6 +14182,37 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/react-router": {
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-7.9.5.tgz",
+      "integrity": "sha512-JmxqrnBZ6E9hWmf02jzNn9Jm3UqyeimyiwzD69NjxGySG6lIz/1LVPsoTCwN7NBX2XjCEa1LIX5EMz1j2b6u6A==",
+      "license": "MIT",
+      "dependencies": {
+        "cookie": "^1.0.1",
+        "set-cookie-parser": "^2.6.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=18",
+        "react-dom": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/react-router/node_modules/cookie": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-1.0.2.tgz",
+      "integrity": "sha512-9Kr/j4O16ISv8zBBhJoi4bXOYNTkFLOqSL3UDB0njXxCXNezjeyVrJyGOWtgfs/q2km1gwBcfH8q1yEGoMYunA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/react-scripts": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/react-scripts/-/react-scripts-5.0.1.tgz",
@@ -15062,6 +15094,12 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/set-cookie-parser": {
+      "version": "2.7.2",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.2.tgz",
+      "integrity": "sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==",
+      "license": "MIT"
+    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
diff --git a/web/frontend/package.json b/web/frontend/package.json
index 1cd27c5..5f787bf 100644
--- a/web/frontend/package.json
+++ b/web/frontend/package.json
@@ -23,6 +23,7 @@
     "papaparse": "^5.5.2",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
+    "react-router": "^7.9.5",
     "react-scripts": "^5.0.1",
     "tabulator-tables": "^6.3.1",
     "typescript": "^4.9.5",
diff --git a/web/frontend/public/index.html b/web/frontend/public/index.html
index ce077e2..b92f780 100644
--- a/web/frontend/public/index.html
+++ b/web/frontend/public/index.html
@@ -16,7 +16,7 @@
         --box-border: 1px solid rgba(0, 0, 0, 0.2);
         --box-shadow: 0px 2px 4px -3px rgba(0, 0, 0, 0.2);
         --border-radius: 4px;
-        --primary: #0d6efd;
+        --primary: #0097A7;
         --contrast-100: #202020;
         --contrast-80: #606060;
         --contrast-60: #909090;
diff --git a/web/frontend/src/components/CaseBuilder/CaseBuilder.tsx b/web/frontend/src/components/CaseBuilder/CaseBuilder.tsx
index 868cf1f..003f83e 100644
--- a/web/frontend/src/components/CaseBuilder/CaseBuilder.tsx
+++ b/web/frontend/src/components/CaseBuilder/CaseBuilder.tsx
@@ -91,6 +91,10 @@ const CaseBuilder = () => {
     setAndSaveScenario(undoStack[undoStack.length - 1]!, false);
   };
 
+  const onSolve = () => {
+    console.log("Solve!");
+  };
+
   return (
     <div>
       <Header
@@ -98,6 +102,7 @@ const CaseBuilder = () => {
         onSave={onSave}
         onLoad={onLoad}
         onUndo={onUndo}
+        onSolve={onSolve}
       />
       <div className="content">
         <Parameters
diff --git a/web/frontend/src/components/CaseBuilder/Header.tsx b/web/frontend/src/components/CaseBuilder/Header.tsx
index 1c151cd..6839df7 100644
--- a/web/frontend/src/components/CaseBuilder/Header.tsx
+++ b/web/frontend/src/components/CaseBuilder/Header.tsx
@@ -15,6 +15,7 @@ interface HeaderProps {
   onSave: () => void;
   onUndo: () => void;
   onLoad: (data: UnitCommitmentScenario) => void;
+  onSolve: () => void;
 }
 
 function Header(props: HeaderProps) {
@@ -36,6 +37,11 @@ function Header(props: HeaderProps) {
           <SiteHeaderButton title="Clear" onClick={props.onClear} />
           <SiteHeaderButton title="Load" onClick={onLoad} />
           <SiteHeaderButton title="Save" onClick={props.onSave} />
+          <SiteHeaderButton
+            title="Solve"
+            variant="primary"
+            onClick={props.onSolve}
+          />
         </div>
         <FileUploadElement ref={fileElem} accept=".json,.json.gz" />
       </div>
diff --git a/web/frontend/src/components/Common/Buttons/SiteHeaderButton.module.css b/web/frontend/src/components/Common/Buttons/SiteHeaderButton.module.css
index bc7048c..216996a 100644
--- a/web/frontend/src/components/Common/Buttons/SiteHeaderButton.module.css
+++ b/web/frontend/src/components/Common/Buttons/SiteHeaderButton.module.css
@@ -12,17 +12,33 @@
   box-shadow: var(--box-shadow);
   border-radius: var(--border-radius);
   cursor: pointer;
-  color: var(--contrast-80);
   text-transform: uppercase;
   font-weight: bold;
   font-size: 12px;
+}
+
+.light {
+  color: var(--contrast-80);
   background: linear-gradient(var(--contrast-0) 25%, var(--contrast-10) 100%);
 }
 
-.SiteHeaderButton:hover {
+.light:hover {
   background: rgb(245, 245, 245);
 }
 
-.SiteHeaderButton:active {
+.light:active {
   background: rgba(220, 220, 220);
 }
+
+.primary {
+  color: white;
+  background: linear-gradient(var(--primary) 25%, color-mix(in hsl, #000, var(--primary) 90%) 100%);
+}
+
+.primary:hover {
+  background: color-mix(in hsl, #fff, var(--primary) 90%);
+}
+
+.primary:active {
+  background: color-mix(in hsl, #000, var(--primary) 90%);
+}
diff --git a/web/frontend/src/components/Common/Buttons/SiteHeaderButton.tsx b/web/frontend/src/components/Common/Buttons/SiteHeaderButton.tsx
index 55a1f14..44e43b9 100644
--- a/web/frontend/src/components/Common/Buttons/SiteHeaderButton.tsx
+++ b/web/frontend/src/components/Common/Buttons/SiteHeaderButton.tsx
@@ -9,12 +9,19 @@ import styles from "./SiteHeaderButton.module.css";
 function SiteHeaderButton({
   title,
   onClick,
+  variant = "light",
 }: {
   title: string;
   onClick?: () => void;
+  variant?: "light" | "primary";
 }) {
+  const variantClass = variant === "primary" ? styles.primary : styles.light;
+
   return (
-    <button className={styles.SiteHeaderButton} onClick={onClick}>
+    <button
+      className={`${styles.SiteHeaderButton} ${variantClass}`}
+      onClick={onClick}
+    >
       {title}
     </button>
   );
diff --git a/web/frontend/src/index.tsx b/web/frontend/src/index.tsx
index 0eea569..394e674 100644
--- a/web/frontend/src/index.tsx
+++ b/web/frontend/src/index.tsx
@@ -8,15 +8,21 @@ import React from "react";
 import ReactDOM from "react-dom/client";
 import reportWebVitals from "./reportWebVitals";
 import CaseBuilder from "./components/CaseBuilder/CaseBuilder";
+import { BrowserRouter, Routes, Route, Navigate } from "react-router";
 
 const root = ReactDOM.createRoot(
   document.getElementById("root") as HTMLElement,
 );
 
 root.render(
-  <React.StrictMode>
-    <CaseBuilder />
-  </React.StrictMode>,
+  <BrowserRouter>
+    <React.StrictMode>
+      <Routes>
+        <Route path="/builder" element={<CaseBuilder />} />
+        <Route path="/" element={<Navigate to="/builder" replace />} />
+      </Routes>
+    </React.StrictMode>
+  </BrowserRouter>,
 );
 
 reportWebVitals();
diff --git a/web/frontend/tsconfig.json b/web/frontend/tsconfig.json
index a5a6cae..a03549e 100644
--- a/web/frontend/tsconfig.json
+++ b/web/frontend/tsconfig.json
@@ -29,7 +29,6 @@
     "noUncheckedIndexedAccess": true,
     "noUnusedLocals": false,
     "noUnusedParameters": false,
-    "checkJs": true
   },
   "include": ["src"]
 }