Use the transition-delay property to set a delay for the transition effect with CSS. You can try to run the following code to set a 1-second delay of transition:
Example
<!DOCTYPE html> <html> <head> <style> div { width: 150px; height: 150px; background: blue; transition: width 3s; transition-delay: 2s; } div:hover { width: 350px; } </style> </head> <body> <h1>Heading One</h1> <p>Hover over the below box to change its width. It begins with a delay of 2 seconds.</p> <div></div> </body> </html>