How to alpha background when select a marker ?

[datto97]

ℹ Please fill out this template when filing an issue.
All lines beginning with an ℹ symbol instruct you with what info we expect. You can delete those lines once you've filled in the info.

Per our *CONTRIBUTING guidelines, we use GitHub for
bugs and feature requests, not general support. Other issues should be opened on Stack Overflow with the tag ios-charts.

Please remove this line and everything above it before submitting.

• I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

ℹ Please replace this with what you did.

What did you expect to happen?

ℹ Please replace this with what you expected to happen.

What happened instead?

ℹ Please replace this with of what happened instead.

DGCharts Environment

DGCharts version/Branch/Commit Number:
Xcode version:
Swift version:
Platform(s) running DGCharts:
macOS version running Xcode:

Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.