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Change Theme, Dark/Light
<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; background-color: lightgreen; border-inline-start: 10px solid blue; animation: mymove 5s infinite; } @keyframes mymove { 50% {border-inline-start: 15px dotted pink;} } </style> </head> <body> <h1>Animation of border-inline-start</h1> <p>Gradually change the border-inline-start property from 10px solid blue to 15px dotted pink, then back:<p> <div id="myDIV"></div> </body> </html>