Following Steps need to be followed to bring CSS Menu like this.
First Login to www.blogger.com
and go to Theme and I have chosen “Picture Window” because some option may not be available in other Themes.
Step 2: Go to “Layout” and Check where is “Cross-Column” and under this click on Add a Gadget as per screenshots mention below.
A form like this image mention below will be opened and leave the blank field in “Title” and copy paste the CSS Menu Codes into “Content”, find CSS Menu codes from this Site: https://www.w3schools.com/css/css_navbar.asp
Finally you can follow this Video for more about it
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