unable to add colored box/text using divs
CMS div coding
<div class="TB_Red BDR_Blue" id="TextBox1">
<p>ffffffff<span style="font-size:36px;">LARGE</span><span style="font-size:36px;"> TEXT IN RED BOX WITH BLUE BORDER</span></p>
</div>
CSS Code
#TextArea1{width:50%;margin;20px auto; height:150px;background-color:green;border:cyan dottted 20px;}
.TB_Red{background-color:red;}
.BDR_Blue{border:blue solid 3px;}
should give e blue box or ar worst green box, but neither is happening
were am i going wrong