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trycss_anim_flex-grow
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<!DOCTYPE html> <html> <head> <style> #main { width: 350px; height: 100px; border: 1px solid #c3c3c3; display: flex; } #main div:nth-of-type(1) {flex-grow: 1;} #main div:nth-of-type(2) {flex-grow: 1;} #main div:nth-of-type(3) {flex-grow: 1;} #myBlueDiv { animation: mymove 5s infinite; } @keyframes mymove { 50% {flex-grow: 8;} } </style> </head> <body> <h1>Animation of flex-grow</h1> <p>Gradually change the flex-grow property of the "blue DIV" from 1 to 8, and back to 1:<p> <div id="main"> <div style="background-color:coral;"></div> <div style="background-color:lightblue;" id="myBlueDiv"></div> <div style="background-color:khaki;"></div> </div> </body> </html>