outline-width
outline:thin solid #333;-----thin=1px
outline:medium solid #333;-----medium=3px
outline:thick solid #333;-----thick=5px
outline:10px solid #333;-----10px
outline-color
outline:5px solid cadetblue;-----color_name
outline:5px solid #ffb400;-----hex_number
outline:5px solid rgba(215,23,136,0.2);-----rgb_number
outline:solid 5px;-----invert
outline-style
outline:5px none #dd524d;-----none无轮廓（默认）
outline:5px dotted #dd524d;-----dotted点状轮廓
outline:5px dashed #dd524d;-----dashed虚线轮廓
outline:5px solid #dd524d;-----solid实线轮廓
outline:5px double #dd524d;-----double双线轮廓
outline:5px groove #dd524d;-----groove-3D凹槽轮廓
outline:5px ridge #dd524d;-----ridge-3D凸槽轮廓
outline:5px inset #dd524d;-----inset-3D凹边轮廓
outline:5px outset #dd524d;-----outset-3D凸边轮廓
inherit从父元素继承
outline: inherit;-----inherit继承父元素属性设置