div h1 {
    text-align: center;
    padding: 2rem;
}
div span {
}
@keyframes fa-blink {
    0% {
    }
    50% {
        color: #7afc16;
    }
    100% {
        color: #54b152;
    }
}
.fa-blink {
    font-weight: bold;
    -webkit-animation: fa-blink 2s linear infinite;
    -moz-animation: fa-blink 2s linear infinite;
    -ms-animation: fa-blink 2s linear infinite;
    -o-animation: fa-blink 2s linear infinite;
    animation: fa-blink 2s linear infinite;
}