how to remove line from a link in css code example

Example 1: how to change hyperlink color in css

a {
  background-color: red;
  color: white;
  padding: 1em 1.5em;
  text-decoration: none;
  text-transform: uppercase;
}

Example 2: css how to style a

/*a normal, unvisited link*/
a:link{
	color: green;
}
/*a link the user has visited*/
a:visited{
	color: purple;
}
/*a link when the user mouses over it*/
a:hover{
	color: yellow;
}
/*a link the moment it is clicked*/
a:active{
	color: brown;
}

Example 3: remove line from a href css

a {
  text-decoration: none;
}

Example 4: how to remove the line from a link in css

/*like suppose I take a tag of html*/
a{
  decoration:none;
}