.blinker_B {
    border: solid 4px red !important;
}

.blinker_A {
    border: solid 4px #1D78EA !important;
}

.hide_element {
    display: none !important;
}


/* FOR QUESTION OPTIONS ANIMATION */
.answer_blink {
	/* Remove deprecated text-decoration */
	-webkit-animation-name: blinker;
	-webkit-animation-duration: 0.6s;
	-webkit-animation-iteration-count: infinite;
	-webkit-animation-timing-function: ease-in-out;
	-webkit-animation-direction: alternate;
	
	/* Standard animation properties */
	animation-name: blinker;
	animation-duration: 0.6s;
	animation-iteration-count: infinite;
	animation-timing-function: ease-in-out;
	animation-direction: alternate;

	background: yellow;
}

@-webkit-keyframes blinker {
  from { opacity: 1.0; }
  to { opacity: 0.0; }
}

@keyframes blinker {
  from { opacity: 1.0; }
  to { opacity: 0.0; }
}