Hi Alex,
Thanks for your reply. Below is the correct custom CSS code to change this. Could you give it a try?
.btn-warning {
color: #fff;
background-color: #f0ad4e;
border-color: #eea236;
}
.btn-primary {
color: #fff;
background-color: #337ab7;
border-color: #2e6da4;
}