'How to change swiper-pagination-bullet background in ionicv4

I am facing problem to change slider bullets in Ionic v4

.swiper-pagination-bullet {
  --bullet-background: red;
}

ionic-framework ionic4

Solution 1:^[1]

Just use

.swiper-pagination-bullet{ background-color:red;}

.swiper-pagination-bullet{ background:red;}

This will work fine.

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Solution	Source
Solution 1	Khushboo