To style every enabled <input> element, use the CSS :enabled selector.
Example
You can try to run the following code to style enabled <input> element
<!DOCTYPE html> <html> <head> <style> input:enabled { background: blue; } </style> </head> <body> <form action = ""> Subject <input type = "text" name = "subject"><br> Student: <input type = "text" name = "student"><br> Age: <input type = "number" name = "age" disabled><br> </form> </body> </html>