made compose button when on articles view.

css/light.css

@@ -110,6 +110,27 @@ textarea {
   border: 3px solid black;
 }
 
+#floating_compose {
+  border: 2px solid black;
+}
+
+#floating_compose,
+#floating_compose * {
+  background-color: black;
+  color: white;
+  transition-duration: 500ms;
+}
+
+#floating_compose:hover,
+#floating_compose:hover * {
+  background-color: white;
+  color: orange;
+}
+
+#floating_compose:hover {
+  border: 2px solid orange;
+}
+
 @media screen and (max-width: 992px) {
   nav {
     border-bottom: none;