How to I replicate this using tcolorbox?

Question

I am trying but I am just unable to get this kind of box.
newtcolorbox{defn}[1][]{
    width=textwidth,
    colback=white!20,
    colframe=blue!75!blue,
    colbacktitle=blue!85!blue,
    fonttitle=bfseries,
    left=2ex,
    right=2ex,
    top=2pt,
    arc=2pt,
    outer arc=0pt,
    leftrule=1pt,
    rightrule=1pt,
    toprule=1pt,
    bottomrule=1pt,
    breakable,
    enhanced jigsaw,
    title= #1}

This gives me something like this:

leandriis · Accepted Answer

Using newtcbtheorem in combination with a boxed title, you can achieve the following output in which the boxes are numbered automatically. You can also use the usual label-ref-mechanism on these boxes.
I have also tried to simplify the other options by summarizing leftrule=1pt, rightrule=1pt, toprule=1pt,bottomrule=1pt, to boxrule=1pt. I have also replaced the corner related options with sharp corners since the corners in your example image seemed to nor be rounded. If you prefer the slightly rounded look, you can easily revert the changes.

documentclass{article}
usepackage[most]{tcolorbox}

newtcbtheorem{defn}{Definition}{
    width=textwidth,
    colback=white!20,
    colframe=orange,
    colbacktitle=orange,
    fonttitle=bfseries,
    sharp corners,
    boxrule=1pt,
    breakable,
    enhanced,
    boxed title style={sharp corners},
    attach boxed title to top left
}{def}

begin{document}

begin{defn}{box title}{label}
contents
end{defn}

ref{def:label}
end{document}

Tanvir · Answer

Here is an example on how you can reproduce the image using tcolorbox.
documentclass{article}
usepackage{tikz,lipsum,lmodern}
usepackage[most]{tcolorbox}
usepackage{xcolor}
%
definecolor{newcolor}{RGB}{246,164,4} % 
begin{document}

begin{tcolorbox}[enhanced,title=Definition 1: Set,
colframe=newcolor,arc=0mm, fonttitle=bfseries,coltitle=white,
attach boxed title to top left={xshift=0.mm,yshift=-0.50mm},
boxed title style={skin=enhancedfirst jigsaw,size=small,arc=0mm,bottom=0mm,
interior style={fill=newcolor}}]
begin{itemize}
 item[$bullet$] A emph{set} is a collection of object.
 item[$bullet$] These objects are called emph{elements} of the set.
 item[$bullet$] If $A$ is a set and $x$ is an element of $A$, write $xin A$.
 item[$bullet$] If $x$ is not an element of $A$, write $Anotin A$.
end{itemize}
end{tcolorbox}
end{document}

How to I replicate this using tcolorbox?

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