Answers for "how to add left and right arrow css"

arrow left css

.arrow-left {
  width: 0; 
  height: 0; 
  border-top: 60px solid transparent;
  border-bottom: 60px solid transparent; 
  border-right: 60px solid blue; 
}

arrow up css

.arrow-up {
  width: 0; 
  height: 0; 
  border-left: 75px solid transparent;
  border-right: 75px solid transparent;
  border-bottom: 75px solid #761E9B;
}