@keyframes bounce {
    0% {
        transform: scale(1);
    }
    30% {
        transform: scale(1.2);
    }
    50% {
        transform: scale(0.95);
    }
    70% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.btn-animate {
    animation: bounce 0.5s;
}