body {
    overscroll-behavior: none;
}
#gameCanvas {
    background: linear-gradient(to bottom, #1a1a2e, #16213e);
}
.fa-shield-virus {
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}