第一：如何让“用户管理”这四个字上下居中？
第二：当鼠标放上去时，绿色怎么才能完全覆盖掉红色？
<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>leftwindow</title><style type="text/css"> #baseInfoManager{ width:180px; height:200px;}#baseInfoManager p{ height:50px; text-indent:20px; background:#ff0000; }#baseInfoManager p a{ display:block; height:50px; width:180px; text-decoration:none; font-family:Arial, Helvetica, sans-serif; font-size:12px;}#baseInfoManager p a:hover{ width:180px; height:30px; color:#000; text-decoration:none; background:#00ff00;}</style></head><body > <div id="baseInfoManager"> <p id="btn"><a href="#">用户管理</a></p> </div></body></html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>leftwindow</title><style type="text/css"> #baseInfoManager{ width:180px; height:200px;}#baseInfoManager p{ height:50px; text-indent:20px; background:#ff0000; }#baseInfoManager p a{ display:block; height:100%; width:100%; text-decoration:none; line-height:50px; font-family:Arial, Helvetica, sans-serif; font-size:12px;}#baseInfoManager p a:hover{ height:100%; width:100%; color:#000; text-decoration:none; background:#00ff00;}</style></head><body > <div id="baseInfoManager"> <p id="btn"><a href="#">用户管理</a></p> </div> </body></html>测试了一下，还是不行；
<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>leftwindow</title><style type="text/css"> #baseInfoManager{ width:180px; height:200px;}#baseInfoManager p{ height:50px; text-indent:20px; background:#ff0000; }#baseInfoManager p a{ display:block; height:100%; width:100%; text-decoration:none; line-height:50px; font-family:Arial, Helvetica, sans-serif; font-size:12px;}#baseInfoManager p a:hover{ height:100%; width:100%; color:#000; text-decoration:none; background:#00ff00;}</style></head><body > <div id="baseInfoManager"> <p id="btn"><a href="#">用户管理</a></p> </div> </body></html>
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