/* animate */
.briter{
    -webkit-animation: 3s briter 0s linear infinite;
    -moz-animation: 3s briter 0s linear infinite;
    -ms-animation: 3s briter 0s linear infinite;
    -o-animation: 3s briter 0s linear infinite;
    animation: 3s briter 0s linear infinite;
}
@keyframes briter {
	0% {
        opacity: 1;
	}
	25% {
        opacity: .3;
	}
	50% {
        opacity: 1;
	}  
}

/* delay */
.delayx1 {
    animation-delay: 1.5s;
}
.delayx2 {
    animation-delay: 3s;
}