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Open the tooltip.css file, and edit its font color and background color as below:
div#mcTooltip
{
line-height:16px;
border-width: 1px;
color:#333;
border-color:#BBBBBB;
padding:20px;
font-size: 12px;
font-family: Verdana, Arial;
border-radius:6px;
box-shadow: 0 1px 4px #AAAAAA;
}
div#mcTooltip, div.mcTooltipInner
{
background-color:#EAECF0;
}