css怎么去掉border的底部

p {

    border-style:solid;

    border-bottom:thick dotted;

}

p {border-style:solid;}

p.none {border-bottom:none;}

p.dotted {border-bottom:thick dotted #ff0000;}

p.dashed {border-bottom:dashed #ff0000;}

p.solid {border-bottom:solid #ff0000;}

p.double {border-bottom:double #ff0000;}

p.groove {border-bottom:groove #ff0000;}

p.ridge {border-bottom:ridge #ff0000;}

p.inset {border-bottom:inset #ff0000;}

p.outset {border-bottom:outset #ff0000;}