Add this to the theme’s Custom CSS feature:
@media (min-width: 992px) {
.navbar-header {
float: none;
line-height: 50px;
}
.navbar-header .site-title {
text-align: center;
margin-top: 10px;
}
.navbar-header .site-title img {
display: inline-block;
}
.header .navbar-right {
float: none !important;
text-align: center;
}
.navbar-nav > li {
float: none;
display: inline-block;
}
.header .navbar-nav > li > a {
padding-top: 10px;
padding-bottom: 5px;
}
}