.thsrc-container {
    background-image: url('https://opencart.cc/assets/img/thsrc.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    min-height: 400px;
    position: relative;
}

.thsrc-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1;
}

.thsrc-content {
    position: relative;
    z-index: 2;
}

.heartbeat-btn {
    animation: heartbeat 2s ease-in-out infinite;
}
@keyframes heartbeat {
    0% { transform: scale(1); }
    14% { transform: scale(1.1); }
    28% { transform: scale(1); }
    42% { transform: scale(1.05); }
    70% { transform: scale(1); }
}