Adjust the width of the logo in appheader

[Starlette]

How can i extend the width of the logo in the appheader?
I have a png of 450 but its cut, Do i change it somewhere else as in the application.css below?

.appLogo {
    height: 43px; 
    width: 450px; 
    background-image: url(appLogo.png);
    _background-image: url(appLogo.gif); /* for IE6 */
    background-repeat: no-repeat;

[Starlette]

I setted it to 410 and now it is working,,,NOT sure if there is a limit...

.appLogo {
height: 43px;
width: 410px;
padding-right: 5px;
float: left;
background: url(images/appLogo2.png) no-repeat 0 0;
_background: url(images/appLogo.gif) no-repeat 0 0;
}