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In fact you don’t need to put the edge behind anything, what you need is to make a curve on the bottom-left edge of the button, for this you need to use CSS:
This would round all edges:
border-radius: 30px
so also round all edges but differently:
border-top-left-radius: 20px;
border-top-right-radius: 10px;
border-bottom-right-radius: 15px;
border-bottom-left-radius: 30px;
So apply on a tag:
<tag style="border-bottom-left-radius: 30px">...
Continue your studies.
Thank you very much friend ! I got it !
– João P. Kuchnir