highlight html text with background-color code example

Example 1: change highlight color html

::-moz-selection { /* Code for Firefox */
  color: red;
  background: yellow;
}

::selection {
  color: red;
  background: yellow;
}

Example 2: html highlight text

For HTML5: (with 'mark' tag)

<p>Do not forget to buy <mark>milk</mark> today.</p> 

In CSS file: (To customize highlight)

mark {
  background-color: yellow;
  color: black;
}