Tcolorbox Theorem environment doesnt show first character

Question

I was going to use tcolorbox theorem environment using a guide on this stackexchange. In the example there, it is good. However when I tried it myself, it always didnt show the first character (so I need to put Enter or {}).

Here is my code

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{tikz}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}

\newtcbtheorem
[]
{define}
{Definition}
{
colback = blue!5,
colframe = blue!35!black,
fonttitle = \bfseries
}
{def}

\begin{document}

\begin{define}{Test 1}
Test abcd
\end{define}

\end{document}

and here is my result

Can somebody help me? I know the problem were minor, but I want to know the correct way of using tcolorbox theorem environment. Any help would be appreciated!

Answer 1

The define environment specified via \newtcbtheorem requires two mandatory parameters, both of which can be empty {}. The first is the title and the second is the <marker> used as a \label and can be referenced via \ref{def:<marker>}:

Including the hyperref package makes the reference a link. You can also use the nameref package for more options.

Code:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{tikz}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}
\usepackage{hyperref}

\newtcbtheorem
[]
{define}
{Definition}
{
colback = blue!5,
colframe = blue!35!black,
fonttitle = \bfseries
}
{def}

\begin{document}

\begin{define}{Test 1}{Test Theorem Label}
Test abcd
\end{define}

As per theorem \ref{def:Test Theorem Label}, we see that
all our problems are now solved.

\end{document}