ADD file via upload

change——css.html

@@ -0,0 +1,66 @@
+body {
+font-family: Arial, sans-serif;
+background-color: #f4f4f4;
+margin: 0;
+padding: 0;
+display: flex;
+justify-content: center;
+align-items: center;
+height: 100vh;
+}
+
+.container {
+background-color: #fff;
+padding: 20px;
+border-radius: 8px;
+box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+width: 300px;
+text-align: center;
+}
+
+h1 {
+color: #333;
+margin-bottom: 20px;
+}
+
+.input-section, .select-section {
+margin-bottom: 20px;
+}
+
+label {
+display: block;
+margin-bottom: 8px;
+color: #666;
+}
+
+input, select {
+width: 100%;
+padding: 8px;
+margin-bottom: 10px;
+border: 1px solid #ddd;
+border-radius: 4px;
+font-size: 16px;
+}
+
+button {
+padding: 10px 20px;
+background-color: #28a745;
+color: #fff;
+border: none;
+border-radius: 4px;
+cursor: pointer;
+font-size: 16px;
+}
+
+button:hover {
+background-color: #218838;
+}
+
+.output-section {
+margin-top: 20px;
+}
+
+#result {
+font-size: 18px;
+color: #333;
+}