HTML table Width = "100%" still didn't fit to window size in ASP.Net

Question

I have a html table for displaying data. I have the typical width="100%"; but it did not work. Here is what my page looks like and my CSS/HTML styling. How can I fix it to auto fit the screen?

Code:

<table style="border: medium solid #FFFFFF; background-color: #000000; position: fixed;"
             border="3" width="100%";>

Answer 1

Make sure your body element has padding and margin set to 0

Without setting this vs when this is set

html, body{
    height:100%;
    width:100%;
    padding:0;
    margin:0;
}

Answer 2

Add this CSS:

body {
    margin: 0
}

Because the default margin for body element in not 0