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<html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script><script> $(document).ready(function(){ function aniDiv(){ $("div:eq(0)").animate({width: "50%"}, "slow"); $("div:eq(0)").animate({width: "100%"}, "slow", aniDiv); } aniDiv(); $(".btn1").click(function(){ $(":animated").css("background-color", "red"); });});</script></head><body><button class="btn1">Change color of the animated element</button><div style="background:blue;">Div 1</div><div style="background:green;">Div 2</div><div style="background:yellow;">Div 3</div></body></html>