fix tcolorboxes splitting

preamble.tex

@@ -16,6 +16,7 @@
 \usepackage{makeidx}
 \usepackage[english]{babel}
 \usepackage{multicol}
+	\raggedcolumns
 \usepackage{graphicx}
 \usepackage{etoolbox}
 \usepackage{titlesec,titletoc}
@@ -210,7 +211,7 @@ interior code={ \path[tcb fill interior] ([xshift=-2mm]interior.west)
 
 %%%%%%%%%%%%%%%%%%%% Environments %%%%%%%%%%%%%%%%%%%%
 
-\newenvironment{boxtext}{\noindent}{}
+\newenvironment{boxtext}{}{}
 
 \newenvironment{speechtext}{\begin{quotation}\noindent}{\end{quotation}}