*{background-color:rgb(20,34,34);transition:1s ease background-color,1s ease color;}.task{background:rgb(172,45,45);color:rgb(0,0,0);}.taskDone{background:rgb(29,151,29);color:rgb(0,0,0);animation:mymove 1s;}@keyframes mymove{from{background-color:rgb(172,45,45);}to{background-color:rgb(29,151,29);}}