how to implement new design without losing the google rank?

Hi all,

Thank you for advance.

I am new in SEO process.

we integrated the new design in our web site. after that, our site
losed the google rank.

1.Does the new dsign affect the google rank?. we are having the old
content with new design such as font, text color, image, placement
location, etc. how to design main page without losing the google
rank.

2.In old design we are using <h1> tag. but now removed the <h1> tag
from new design. is it affect the google rank?.

3.How Important is H1 (Header) Tags in SEO Process?

4.Can we add the css calss for <h1> tag?. suppose if we are using <h1>
tag without css class, it will occupips some more spaces.

example.
<h1>keyword</h1>
<h1 class="h1calss">keyword</h1>

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