Use an equal sign with SLIM Template(HTML)

hi , Please i have a problem with Slim when i write that:
a.btn class=["btn-lg", "col-xs-2"> =
the equal sign does not display in the rendered page. i dont know why.
Thanks for your help

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Hi Lionel, here is my project
link https://codepen.io/itechcorp/pen/EvagLq?editors=1100

I found a solution to my problem it was just necessary to do this: