各个浏览器下 全屏状态下背景色设置

[any86]

:-webkit-full-screen {  
  background-color: @content-bg !important;  
}  
:-moz-full-screen {  
  background-color: @content-bg !important;  
}  
  
:-ms-fullscreen {  
  background-color: @content-bg !important;  
}  
:fullscreen {  
  background-color: @content-bg !important;  
}