.animated {
 -webkit-animation-duration: 2s;
 animation-duration: 2s;
 -webkit-animation-fill-mode: both;
 animation-fill-mode: both;
}
@-webkit-keyframes flash {
 0%, 50%, 100% {
 opacity: 1;
 }
25%, 75% {
 opacity: 0;
 }
}
@keyframes flash {
 0%, 50%, 100% {
 opacity: 1;
 }
25%, 75% {
 opacity: 0;
 }
}
.flash {
 -webkit-animation-name: flash;
 animation-name: flash;
}