What is the desired result?
this is the standard styling for the wizard from the building blocks (wizard arrow), it depends on what you want to change.
e.g. if you wish to change the active-color you can do so by adding this in a custom-scss file:
.wizard-arrow .wizard-step-active {
background-color: #yourhexcolorhere;
}
However, due take note, the diagonal arrow part that's behind it should also be targeted, which can be done through like so:
.wizard-arrow .wizard-step-active::after {
border-left-color: #yourhexcolorhere;
}