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/*河道噗首按鈕擋起來*/
.manager { position:relative; }
.manager:after {
	/*這行勿動*/ content:""; width:100%; height:100%; display:block;
	/*這行勿動*/ position:absolute; top:0; left:0; transition:height .6s;
	/*圓角大小*/ border-radius:5px;
	/*顏色*/ background:#000A;
}
.manager:hover:after {
	/*這行勿動*/ height:0; transition:height 0.6s
	/*停留多久才打開*/ 2s;
}