why is height: 100% not working
/*this is how to make height: x% work in HTML. you have to set the height of the body to 100vh or nothing will happen regarding height of the element.*/ <html> <head> <style> body { height: 100vh; } #box { width: 20px; height: 100%; } </style> </head> <body> <div id = 'box'></div> </body> </html>