How to add this "bar" above the menu? HTML + CSS

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How to add a grid equal to what Stackoverflow has at the top of the menu? I know it seems like a very ignorant question on my part, but I find it very difficult in HTML and CSS!

    
asked by anonymous 23.09.2018 / 05:04

1 answer

1

It's only a border-top : 

html, body { margin: 0 }

header {
  border-top: 3px solid #F48024;
  box-shadow: 0 0 10px 2px #ccc;
  height: 40px
}
<header></header>
    
23.09.2018 / 05:12
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