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<!DOCTYPE html> <html> <head> <style> #main { width: 270px; height: 300px; border: 1px solid black; display: flex; } #main div { flex: 1; } #myBlueDiv { animation: mymove 5s infinite; } @keyframes mymove { 50% {flex: 3;} } </style> </head> <body> <h1>Animation of flex</h1> <p>Gradually change the flex property of the BLUE div element from 1 to 3, and back:<p> <div id="main"> <div style="background-color:coral;">RED</div> <div style="background-color:lightblue;" id="myBlueDiv">BLUE</div> <div style="background-color:lightgreen;">GREEN</div> </div> </body> </html>
