修改 /usr/share/otrs/Kernel/Output/HTML/Standard/css.dtl
body { font-family:Geneva,Helvetica,Arial,sans-serif;font-size:11pt;background-color:#003399;color:black; }
.header { color:#ffffff;background-color:#2c4909;font-size:12px;vertical-align:top; }
.footer { color:#ffffff;background-color:#2c4909;font-size:10px; }
.mainhead { color:#ffffff;background-color:#2c4909;font-size:13px;font-family:Geneva,Helvetica,Arial,sans-serif;font-weight:bold;vertical-align:top; }
工具栏颜色字体为白色
整体背景