CSS3混合模式background-blend-mode

注意：background属性中的背景图片和颜色混合，只能在一个background属性中。

属性值：

background-blend-mode: normal;          //正常
background-blend-mode: multiply;        //正片叠底
background-blend-mode: screen;          //滤色
background-blend-mode: overlay;         //叠加
background-blend-mode: darken;          //变暗
background-blend-mode: lighten;         //变亮
background-blend-mode: color-dodge;     //颜色减淡
background-blend-mode: color-burn;      //颜色加深
background-blend-mode: hard-light;      //强光
background-blend-mode: soft-light;      //柔光
background-blend-mode: difference;      //差值
background-blend-mode: exclusion;       //排除
background-blend-mode: hue;             //色相
background-blend-mode: saturation;      //饱和度
background-blend-mode: color;           //颜色
background-blend-mode: luminosity;      //亮度

background-blend-mode: initial;         //初始
background-blend-mode: inherit;         //继承
background-blend-mode: unset;           //复原