With Android Lollipop, Google released it's unique Material Design which I personally like a lot. I changed my website design to it just recently. But there are tons of Material Design for HTML out there! Which one should you choose?
If your website runs with Bootstrap or you'd like to create a website with Bootstrap, I'd recommend Bootswatch Paper. It's really easy to add it to your existing Bootstrap website, because you just have to change the Bootstrap CSS file. It does not feature the best material look and feel, but because of it's simplicity it's great. Also, because it runs on Bootstrap, you have all of the Bootstrap features, including modals, navbars, rows, buttons, form elements, tooltips and many more.
This framework is a bit like Materialize. It is made by Google and looks a bit tidier and more "professional" than Materialize. It has tons of components that are well documented. Also, it has much more animations and they are nearly the same as on Android. Obviously, because Google uses it in almost every modern web based project.
With those three frameworks, you should have a good selection. Of course, there are many more out there, but that are the frameworks I worked with and I personally like.
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