100% DIV width is not really 100%

Question

When I have a

with width: 100%, it is not really 100%:

testtesttesttesttest

...

#di         


        

Answer 1

add this to css:

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

Then it should work.