Box Model form problem on Visual Studio

I’m having some trouble with Visual Studio. During the Box Model video at 0:45, he puts in “form {}” which then autopopulates the next few lines of padding, border and margin, but that doesn’t happen for me when I press the Tab key. How can I fix this? Is there a certain setting I should change in Preferences?

There is no such extension that can auto populate your css value, from what I see in the video he pasted that he have copied before. But here is an extension that can autocomplete the css properties.