gistfile1.css

/* animation for even number of compose windows */
@-webkit-keyframes streakComposeTriggerEven {
  from { clip: rect(1px, auto, auto, auto); }
  to { clip: rect(0px, auto, auto, auto); }
}

.streakGmailComposeChildren:first-child:nth-last-child(2n) {
  -webkit-animation-duration: 0.001s;
  -webkit-animation-name: streakComposeTriggerEven;
}

/* animation for odd number of compose windows */
@-webkit-keyframes streakComposeTriggerOdd {
  from { clip: rect(0px, auto, auto, auto); }
  to { clip: rect(1px, auto, auto, auto); }
}

.streakGmailComposeChildren:first-child:nth-last-child(2n+1) {
	-webkit-animation-duration: 0.001s;
	-webkit-animation-name: streakComposeTriggerOdd;
}