* {
    padding: 0;
    margin: 0
}

.content-center {
    margin: 20;
}

.pulse i {
    color: #db0000,    
}

.pulse {
    height: 70px;
    width: 70px;
    background-color: rgb(0, 151, 224);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative
}

.pulse::before {
    content: "";
    position: absolute;
    border: 1px solid rgb(0, 151, 224);
    width: calc(100% + 40px);
    height: calc(100% + 40px);
    border-radius: 50%;
    animation: pulse 1s linear infinite
}

.pulse::after {
    content: "";
    position: absolute;
    border: 1px solid rgb(0, 151, 224);
    width: calc(100% + 40px);
    height: calc(100% + 40px);
    border-radius: 50%;
    animation: pulse 1s linear infinite;
    animation-delay: 0.3s
}

@keyframes pulse {
    0% {
        transform: scale(0.5);
        opacity: 0
    }

    50% {
        transform: scale(1);
        opacity: 1
    }

    100% {
        transform: scale(1.3);
        opacity: 0
    }
}