.img_dark{
    filter:grayscale(50%);
    -webkit-filter:grayscale(50%);
    -moz-filter:grayscale(50%);
    -ms-filter:grayscale(50%);
    -o-filter:grayscale(50%);
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=0.5);


}

.body_dark{
    color: #8F8F8F;
    background-color: #000000;

}


.img_light{
    /*-webkit-filter: brightness(100%); !*考虑浏览器兼容性：兼容 Chrome, Safari, Opera *!
    filter: brightness(100%);*/
    filter:grayscale(0%);
    -webkit-filter:grayscale(0%);
    -moz-filter:grayscale(0%);
    -ms-filter:grayscale(0%);
    -o-filter:grayscale(0%);
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=0);



}
.body_light{

    background-color: #FFFFFF;
    color: #666666;
}