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由灰色渐变成蓝色，样式如下
a {
color: #999999;
color: rgba(155,155,155,.5);
-webkit-transition: all .2s ease-in-out;
-moz-transition: all .2s ease-in-out;
transition: all .2s ease-in-out;
}
a:hover {
color: #7777FF;
text-shadow: 0 0 10px rgba(125,125,125,.25);
}