css3 改变默认选中文本背景色和文本颜色

::selection {
    background:#d3d3d3; 
    color:#555;
}

::-moz-selection {
    background:#d3d3d3; 
    color:#555;
}

::-webkit-selection {
    background:#d3d3d3; 
    color:#555;
}