You can edit file ../templates/ot_deluxelight/css/layout.css
Line 90
div.ot-headertop-1, div.ot-logo, div.ot-headertop-2 {
float: left;
width: 30%;
}
Line 158
div.ot-logo {
width: 38%;
}
Line 164
div.ot-logo a.logo {
background: url("../images/logo.png") no-repeat scroll 0 0 rgba(0, 0, 0, 0);
display: block;
height: 117px;
width: 361px;
}
* Note: a total width of blocks (ot-headertop-1, ot-logo, ot-headertop-2) less than or equal to 100%