updates of preface

structure.tex

@@ -2,7 +2,7 @@
 % !TEX encoding = UTF-8 Unicode
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-% This file was modified on top of 
+% This file was modified on top of
 % The Legrand Orange Book
 % Structural Definitions File
 %
@@ -10,7 +10,7 @@
 % Mathias Legrand (legrand.mathias@gmail.com) with modifications by:
 % Vel (vel@latextemplates.com)
 %
-% Current Version is maintained by 
+% Current Version is maintained by
 % Tong Xiao (xiaotong@mail.neu.edu.cn)
 % Runzhe Cao (854581319@qq.com)
 %
@@ -628,7 +628,7 @@ addtohook={%
 \definecolor{ublue}{rgb}{0.152,0.250,0.545}
 \definecolor{ugreen}{rgb}{0,0.5,0}
 \definecolor{lgreen}{rgb}{0.9,1,0.8}
-\definecolor{xtgreen1}{rgb}{0.824,0.898,0.8}
+\definecolor{amber}{rgb}{1.0, 0.75, 0.0}
 \definecolor{xtgreen}{rgb}{0.914,0.945,0.902}
 \definecolor{lightgray}{gray}{0.85}
 
@@ -677,4 +677,4 @@ addtohook={%
 \newcommand\chapterfifteen{第十五章}
 \newcommand\chaptersixteen{第十六章}
 \newcommand\chapterseventeen{第十七章}
-\newcommand\chaptereighteen{第十八章}%*
\ No newline at end of file
+\newcommand\chaptereighteen{第十八章}%*