Cannot setup floating action buttons as class cannot be found (Android Studio)

Question

So I am pretty new to android and I am trying to setup a floating action button with the Android Design Support Library using this guide in Android Studio.

My Projec

Answer 1

The latest version of Android Studio 3.1.2 seems to not like compile in build.gradle file. Instead I used implementation and it worked fine.

implementation 'com.android.support:design:27.1.1'