Preventing “double” borders in CSS

Question

Say I have two divs next to each other (take https://chrome.google.com/webstore/category/home as reference) with a border.

Is there a way (preferably a CSS trick) to

Answer 1

You can use odd selector to achieve this

.child{
   width:50%;
   float:left;
   box-sizing:border-box;
   text-align:center;
   padding:10px;
   border:1px solid black;
   border-bottom:none;
}
.child:nth-child(odd){
   border-right:none;
}
.child:nth-last-child(2),
.child:nth-last-child(2) ~ .child{
   border-bottom:1px solid black
}

    
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