Hello Gary,
You can find the styling options within the live composer itself.
However here is a quick fix for you. Please add the following css inside the additional css section of your customizer and let us know;
#dslc-module-19535907cc7 #header-meta a.btn {
margin: 20px 10px;
}
@media screen and (max-width: 998px){
#dslc-module-19535907cc7 #header-meta {
text-align: center;
}
}
Thanks!
Bidur