In default css find below.. if you can't find on the same line you can find the class/id
on line #60 in body
body{
/*add this*/
position: relative;
}
on line #216 in #qa-login-bar
#qa-login-bar{
/* add this */
position: fixed;
top: 0;
right: 0;
bottom: auto;
left: 0;
z-index: 9999;
}
on line #422 .qa-body-wrapper
.qa-body-wrapper{
/*add this*/
padding-top: 30px;
}
