Hello

Thank you for your query.

This CSS is coming from template.css file. In order to change it you will need to write custom css against this class: bg-gradient-seconday. Kindly check the screenshot below.

The following is the current css for the gradient written in template.css file:

.bg-gradient-seconday {
  background: linear-gradient(252.18deg, rgba(255, 255, 255, 0.14) 11.82%, rgba(6, 112, 250, 0.14) 40.94%), radial-gradient(291.37% 879.16% at 94.46% 52.36%, rgba(233, 112, 37, 0.03) 0%, rgba(233, 112, 37, 0) 100%), linear-gradient(105.63deg, rgba(0, 186, 235, 0.244) 19.96%, rgba(6, 112, 250, 0) 44.52%, rgba(136, 0, 201, 0.124) 65.42%), #001b52;
}