Asp.net sitemap menu flickering

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Good Morning!...

I am using ASP.NET Sitemap httpcntext menu.

i am getting flickering problem in that.

for exmple, when i click alert message the got flickering. this will be happening all the page.

To avoid i tried to add some coede in CSS. but, not working.

.menu ul li
{
position: relative; 
float: left;
list-style: none;
}

.menu ul li ul
{
display: none;
}

.menu li 
{ 
right:0; 
position:absolute; 
top:0 
}

What I have tried:

To avoid i tried to add some coede in CSS. but, not working.

.menu ul li
{
position: relative;
float: left;
list-style: none;
}

.menu ul li ul
{
display: none;
}

.menu li
{
right:0;
position:absolute;
top:0
}