The border-spacing specifies the width between table cells. It can take either one or two values; these should be units of length.
Example
You can try to run the following code to set the width of table cells:
<html> <head> <style> table.one { border-collapse:separate; width:300px; border-spacing:15px 40px; } </style> </head> <body> <table class = "one" border = "2"> <caption>The border-spacing property</caption> <tr><td> India </td></tr> <tr><td> UK </td></tr> </table> <br /> </body> </html>