Check out example codes for "how to slow down hover effect css". It will help you in understanding the concepts better.

Code Example 1

-webkit-transition: all 500ms ease;
-moz-transition: all 500ms ease;
-ms-transition: all 500ms ease;
-o-transition: all 500ms ease;
transition: all 500ms ease;

Learn ReactJs, React Native from akashmittal.com