add some style/css

static/style.css

@@ -0,0 +1,54 @@
+body {
+  font-family: Arial, sans-serif;
+  background-color: #f0f8ff;
+  color: #333;
+  text-align: center;
+  margin: 0;
+  padding: 0;
+}
+
+.container {
+  max-width: 600px;
+  margin: 50px auto;
+  padding: 20px;
+  background-color: #ffffff;
+  border-radius: 8px;
+  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
+}
+
+h1 {
+  color: #0073e6;
+}
+
+form {
+  margin-top: 20px;
+}
+
+label {
+  font-weight: bold;
+}
+
+select, button {
+  padding: 10px;
+  margin-top: 10px;
+  border-radius: 5px;
+  border: 1px solid #ccc;
+  width: 100%;
+}
+
+button {
+  background-color: #0073e6;
+  color: #fff;
+  cursor: pointer;
+}
+
+button:hover {
+  background-color: #005bb5;
+}
+
+.result {
+  margin-top: 30px;
+  padding: 20px;
+  background-color: #f9f9f9;
+  border-radius: 8px;
+}