Hi angelatveit75
It's brand color of template, if you want to change it globally, I recommend you to change via LESS file.
1/ Backup your site first
2/ Open the file: root/templates/ja_mason/less/variables.less
// Brand colors
// -------------------------
@brand-primary: #ffc400;
@brand-secondary: #428bca; // T3 Note: Add secondary color
@brand-success: #5cb85c;
@brand-warning: #f0ad4e;
@brand-danger: #d9534f;
@brand-info: #5bc0de;
and change the color for variable: @brand-primary
Once done, you can compile less to css to take effect: https://www.t3-framework.org/documentation/bs3-configuration#compile-less
Remember to backup your site first.
Regards