.blue-button-pulse {
    animation: blue-button-pulse 1.4s infinite;
}

@-webkit-keyframes blue-button-pulse {
    0% {
        -webkit-box-shadow: 0 0 0 0 rgba(63,112,249, 0.4);
    }
    70% {
        -webkit-box-shadow: 0 0 0 9px rgba(63,112,249, 0);
    }
    100% {
        -webkit-box-shadow: 0 0 0 0 rgba(63,112,249, 0);
    }
}
@keyframes blue-button-pulse {
    0% {
        -moz-box-shadow: 0 0 0 0 rgba(63,112,249, 0.4);
        box-shadow: 0 0 0 0 rgba(63,112,249, 0.4);
    }
    70% {
        -moz-box-shadow: 0 0 0 9px rgba(63,112,249, 0);
        box-shadow: 0 0 0 9px rgba(63,112,249, 0);
    }
    100% {
        -moz-box-shadow: 0 0 0 0 rgba(63,112,249, 0);
        box-shadow: 0 0 0 0 rgba(63,112,249, 0);
    }
}