eu modifiquei

static/css/style.css

 body {
-    background-color: #f4f4f4;
-    font-family: Arial, sans-serif;
+    font-family: Arial;
+    background: #f4f4f4;
+    margin: 0;
 }
 
-h1 {
-    color: #2c3e50;
+.topo {
+    background: #2d6a4f;
+    color: white;
+    padding: 15px;
     text-align: center;
+}
+
+nav a {
+    color: white;
+    margin: 10px;
+    text-decoration: none;
+    font-weight: bold;
+}
+
+.container {
+    width: 80%;
+    margin: 20px auto;
+}
+
+table {
+    width: 100%;
+    border-collapse: collapse;
+    background: white;
+}
+
+th {
+    background: #40916c;
+    color: white;
+}
+
+th, td {
+    padding: 10px;
+    text-align: center;
+}
+
+tr:nth-child(even) {
+    background: #f1f1f1;
+}
+
+button {
+    background: #2d6a4f;
+    color: white;
+    border: none;
+    padding: 10px;
+    cursor: pointer;
+}
+
+button:hover {
+    background: #1b4332;
 }
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