better custom easing and timing defaults

Author: Adam Argyle

src/_base.css

@@ -1,7 +1,7 @@
 [transition] {
   animation-delay: var(--transition__delay, 0);
-  animation-duration: var(--transition__duration, 1.25s);
-  animation-timing-function: var(--transition__easing, ease-in-out);
+  animation-duration: var(--transition__duration, 2.5s);
+  animation-timing-function: var(--transition__easing, cubic-bezier(.25, 1, .30, 1));
   animation-fill-mode: both;
 }