The code is also quite light, so you do not have to worry if the code is going to weigh on the loading speed of your blog. For those who want to try please follow these steps:
Login to Blogger> Open Template Editor> Then add the following code before </ body>
There are two highlighted codes, one is the CSS of the Displaying message and the second one is the displaying message. You can modify these two codes according to your taste.
Save your template, then check your blog after enabling an Adblock extension to your browser and ensure that the code is going well.