Update app.py

Apply gradients to generate button

app.py

@@ -394,7 +394,8 @@ body {
     color: #333;
 }
 .custom-button {
-    background: #1E2125;
+    background: linear-gradient(rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 0.8) 100%);
+    color: transparent;
     font-size: 30px;
     color: white;
     padding: 10px 20px;
@@ -406,6 +407,11 @@ body {
 .custom-button:hover {
     opacity: 0.8;
 }
+.custom-button::before {
+    background: linear-gradient(90deg, rgb(29, 161, 255) 0%, rgb(163, 44, 255) 56%, rgb(251, 156, 255) 100%);
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+}
 .custom-title {
     font-size: 36px;
     background: linear-gradient(271.15deg, #00C7E2 0.27%, #12C06D 102.07%);