.thump-slow {
    animation: scale-in-center 1s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
    animation-iteration-count: infinite;
}

.thump-fast {
    animation: scale-in-center-2 0.35s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
    animation-iteration-count: infinite;
}

@keyframes scale-in-center {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    10% {
        transform: scale(0.97);
        opacity: 1;
    }
    20% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes scale-in-center-2 {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    45% {
        transform: scale(0.95);
        opacity: 1;
    }
    92% {
        transform: scale(1);
        opacity: 1;
    }
}