@-webkit-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@-moz-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }

:root{
    --ofset-time-cb: 0.4s;
}

.fade-in {
	opacity:0; 
	-webkit-animation:fadeIn ease-in 1;  
	-moz-animation:fadeIn ease-in 1;
	animation:fadeIn ease-in 1;

	-webkit-animation-fill-mode:forwards;  
	-moz-animation-fill-mode:forwards;
	animation-fill-mode:forwards;

	-webkit-animation-duration:1s;
	-moz-animation-duration:1s;
	animation-duration:1s;
}

.fade-in.zero {
    -webkit-animation-delay: var(--ofset-time-cb);
    -moz-animation-delay: var(--ofset-time-cb);
    animation-delay: var(--ofset-time-cb);
}

.fade-in.one {
    -webkit-animation-delay: 0.7s;
    -moz-animation-delay: 0.7s;
    animation-delay: 0.7s;
}
    
.fade-in.two {
    -webkit-animation-delay: 1.2s;
    -moz-animation-delay:1.2s;
    animation-delay: 1.2s;
}
    
.fade-in.three {
    -webkit-animation-delay: 1.6s;
    -moz-animation-delay: 1.6s;
    animation-delay: 1.6s;
}

.fade-in.four {
    -webkit-animation-delay: 2.1s;
    -moz-animation-delay: 2.1s;
    animation-delay: 2.1s;
}