Update app.py

app.py

@@ -1,18 +1,23 @@
 import gradio as gr
 
-with gr.Blocks(css="""
-body { background-color: #111; color: white; margin: 0; padding: 0; }
+custom_css = """
+body {
+    background-color: #111;
+    color: white;
+    margin: 0;
+    padding: 0;
+}
 
-.full-center {
+.center-container {
     display: flex;
-    flex-direction: column;
     justify-content: center;
     align-items: center;
+    flex-direction: column;
     height: 100vh;
     text-align: center;
 }
 
-a.button-link {
+.button-link {
     display: inline-block;
     padding: 12px 24px;
     background-color: #007bff;
@@ -20,16 +25,18 @@ a.button-link {
     border-radius: 6px;
     text-decoration: none;
     font-size: 16px;
-    margin-top: 12px;
+    margin-top: 16px;
 }
-""") as app:
-    with gr.HTML("<div class='full-center'>"):
-        gr.HTML("<h2>OptionStrat Flow</h2>")
-        gr.HTML("""
-            <a class="button-link" href="https://optionstrat.com/flow" target="_blank">
-                Truy cập Option Flow
-            </a>
-        """)
-        gr.HTML("</div>")
+"""
+
+with gr.Blocks(css=custom_css) as app:
+    gr.HTML("""
+    <div class="center-container">
+        <h2>OptionStrat Flow</h2>
+        <a class="button-link" href="https://optionstrat.com/flow" target="_blank">
+            Truy cập Option Flow
+        </a>
+    </div>
+    """)
 
 app.launch()