Ruby on Rails

I tried this which doesn't seem to do anything either:
page[k].set_style :z_index => 20

I believe that the following syntax is valid:
page[k].set_style :'z-index' => 20

I tried this:

C:\Users\Laurence>irb
irb(main):001:0>
irb(main):002:0*
irb(main):003:0* x = :'z-index'
=> :"z-index"
irb(main):004:0> x.class
=> Symbol
irb(main):005:0>
irb(main):009:0> x
=> :"z-index"
irb(main):010:0>

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