@fritzhesse: This is complicated in responsive theme as you need to check on mobile devices. The site you have given in reference is not responsive design so it’s easier there.
Try adding in the following CSS in “Appearance => Theme Options => Custom CSS” box.
@media screen and (min-width: 1061px) {
.site { position: absolute; }
#masthead {
background-color: #FFFFFF;
display: block;
left: 0;
position: fixed;
top: 0;
width: 100%;
z-index: 999;
}
#hgroup-wrap,
#header-menu {
margin: 0 auto;
width: 990px;
}
#main {
padding-top: 168px;
}
.home #main-slider {
padding-top: 168px;
}
.home #main {
padding-top: 40px;
}
}
@media screen and (min-width: 1190px) {
#hgroup-wrap,
#header-menu {
width: 1140px;
}
.home #main {
padding-top: 50px;
}
}