arrow with after css code example

Example 1: arrow down css

.arrow-down {
  width: 0; 
  height: 0; 
  border-left: 75px solid transparent;
  border-right: 75px solid transparent;
  border-top: 75px solid #f00;
}

Example 2: arrow left css

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