create css folder

css/main.css

@@ -0,0 +1,28 @@
+body {
+    background: linear-gradient(-45deg, #4567BD, #343E80);
+}
+
+#center {
+    margin: 2%;
+    padding: 2%;
+    border-radius: 2em;
+    background-color: white;
+    opacity: 0.5;
+}
+
+#title {
+    font-weight: bold;
+}
+
+big {
+    font-size: 20px;
+}
+
+#NTUST {
+    width: 9.87%;
+}
+
+#angry {
+    font-size: 200%;
+    vertical-align: top;
+}