libowen0 2019-07-01
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> #parent { width: 500px; height: 500px; background: lightgray; position: relative; } #child { background: white; width: 250px; height: 250px; position: absolute; top: 50%; transform: translate(50%, -50%); } </style> </head> <body> <div id="parent"> <div id="child"></div> </div> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> #parent { width: 500px; height: 500px; background: lightgray; display: flex; align-items: center; justify-content: center; } #child { background: white; width: 250px; height: 250px; } </style> </head> <body> <div id="parent"> <div id="child"></div> </div> </body> </html>