override class property

Dear all,
I have this :
.n_splitter {
	width         : 100%;
	border-top    : 1px solid #E6E6E6;
	margin-bottom : 19px;
}
.n_splitter span {
	width      : 50px;
	height     : 3px;
	float      : right;
	margin-top : -2px;
}
<div class="n_splitter"><span class="n_bgcolor"></span></div>

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What the class AR should be to override  .n_splitter span {float:right}?
<div class="n_splitter AR"><span class="n_bgcolor"></span></div>

thanks
ethar1Asked:
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Scott Fell, EE MVEConnect With a Mentor DeveloperCommented:
.n_splitter.AR span{float:none}
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