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Change Theme, Dark/Light
<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; outline: 15px solid red; animation: mymove 5s infinite; } @keyframes mymove { 50% {outline-color: blue;} } </style> </head> <body> <h1>Animation of outline-color</h1> <p>Gradually change the outline-color property from red to blue then back to red:<p> <div id="myDIV"></div> </body> </html>