Given a in HTML I want to change its color on mouse over.

To change the color of a `<</a> span element on mouse over , you can use CSS to add a hover effect . Here ' s an example : \n ``` html \n <</a> span style =" color : blue ; background - color : white ;"> H over over me span \n ``` \n \n ``` css \n span : hover { \n color : red ; \n background - color : black ; \n } \n ``` \n In this example , the `<</a> span element has a blue color and a white background by default . When the mouse is hover ed over the element , the color will change to red and the background will change to black . You can adjust the colors and styles to fit your needs . </s>