Hola mi web es www.concursosrd.com y nadamas tengo 2 errores uno lo puedo corregir con css pero este me esta volviendo loco. Este es el link del w3c
Line 59, Column 53: document type does not allow element "table" here; missing one of "button", "map", "object", "ins", "del", "noscript" start-tag
<h2 class="sidelink menuheader"><table class="tabla">
The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").