I just realized that the <hr /> divider line is not longer working in wordpress.com. Luckily i find a very good post which has several pieces of HTML codes to add the divider in WordPress post.
Solid Line
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<div class="aligncenter" style="width:400px;height:0;border-top:2px solid #FF7500;font-size:0;">-</div>
Dotted Line
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<div class="aligncenter" style="width:400px;height:0;border-top:2px dotted #880088;font-size:0;">-</div>
Dashed Line
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<div class="aligncenter" style="width:400px;height:0;border-top:2px dashed #FF00FF;font-size:0;">-</div>
Double Solid Line
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<div class="aligncenter" style="width:400px;height:0;border-top:2px double #0000A0;font-size:0;">-</div>
The following are 3D lines with the same color.
Groove Line
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<div class="aligncenter" style="width:400px;height:0;border-top:4px groove #008000;font-size:0;">-</div>
Ridge Line
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<div class="aligncenter" style="width:400px;height:0;border-top:4px ridge #008000;font-size:0;">-</div>
Inset Line
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<div class="aligncenter" style="width:400px;height:0;border-top:4px inset #008000;font-size:0;">-</div>
Outset Line
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<div class="aligncenter" style="width:400px;height:0;border-top:4px outset #008000;font-size:0;">-</div>
You can also make use of the border-bottom to add the 2nd line.
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<div class="aligncenter" style="width:400px;height:3px;border-top:2px dotted #FF0000;border-bottom:2px dotted #FF0000;font-size:0;">-</div>
You can find more details the post by Panos. Click the link of wordpress tips at the bottom of the post.
Done =)
Reference:
Eureka! 
Very timely and right on target! Thanks for the great information and specific details, you could not have made it easier. Thanks.
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You are welcome. =)
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This saved my website from a slight misalignment in some browsers. I tried others dividers and space makers, but they did not work, yours did. Thanks
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Thanks for your comment and glad to know it helps. =)
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Don’t work because here calls a class that you may not have. Check the “aligncenter” class.
You have to add this style to your css file:
.aligncenter { display: block; margin-left: auto; margin-right: auto; }Good luck
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