text with semi-transparent color filled box

Question

I have this text:

\begin{flushleft}
    \fontsize{16pt}{16pt}\selectfont\textit{some text}\\
    \fontsize{16pt}{16pt}\selectfont\textit{some text}
\end{flushleft}

and I would like to have a filled box with a semi-transparent color (eg. white or light gray) underlying this text. I've found several examples for beamer, but this is for a report, I assume that beamer is different from report in this sense in Latex.

I appreciate some support to do this, thanks in advance,

please provide a complete example which is compilable! What have you tried so far? This post is quite vague. Why do you need transparency if you are putting the text above that? You should search this side for mdframed — LaRiFaRi, Sep 05 '14 at 11:20

score 7 · Accepted Answer · 2014-09-05T22:36:48.780

With just tikz

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}
  \begin{tikzpicture}
    \node[fill=olive,fill opacity=0.3,rounded
        corners=1ex,font=\fontsize{16pt}{16pt}\itshape] (a) {Some text};
    \node[preaction={fill=olive},rounded corners=1ex,below=of
        a,font=\fontsize{16pt}{16pt}\itshape] (b) {Some text};
    \node[preaction={fill=olive,fill opacity=0.5},rounded corners=1ex,below=of
        b,font=\fontsize{16pt}{16pt}\itshape] (c) {Some text};
  \end{tikzpicture}
\end{document}

enter image description here

With tcolorbox

\documentclass{article}
\usepackage[many]{tcolorbox}

\begin{document}
  \begin{tcolorbox}[
    width=\textwidth,
    arc=3mm,
%    auto outer arc,
    boxsep=0cm,
    toprule=1pt,
    leftrule=1pt,
    bottomrule=1pt,
    rightrule=1pt,
    colframe=blue,
    fontupper=\raggedleft\itshape]
     \fontsize{16pt}{16pt}
     Some text
\end{tcolorbox}%
\end{document}

enter image description here

Here is an environment version with transparency:

\documentclass{article}
\usepackage[many]{tcolorbox}
\usepackage{lmodern}    % just to avoid font size warnings

\newtcolorbox{mybox}[1][]{
    width=\textwidth,
    arc=3mm,
%    auto outer arc,
    boxsep=0cm,
    toprule=1pt,
    leftrule=1pt,
    bottomrule=1pt,
    rightrule=1pt,
    colframe=blue,
    fontupper=\raggedleft\fontsize{16pt}{16pt}\itshape,
    breakable,
    nobeforeafter,
    enhanced jigsaw,
    opacityframe=0.5,
    opacityback=0.5
}

\begin{document}
  \begin{mybox}[]
     Some text here just to fill the line and see if the line breaks smoothly and goes to the next. If not, I am in deep trouble ;-)
  \end{mybox}
\end{document}

enter image description here

This breaks across pages too.

nice answer, thanks for that, could you add please the transparency option for tcolorbox and also to automatic fit the box to the text length? I have three lines and the box is always bigger than the longer text. — Gery, Sep 05 '14 at 14:06
@Gery Transparency for both frame and background added in the third code and width is \textwidth. — , Sep 05 '14 at 14:10
one more question, to offset 1 cm to the left the whole box (ie. going beyond the textwidth), is that possible with tcolorbox? — Gery, Sep 05 '14 at 18:16

text with semi-transparent color filled box

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