.powerup {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: 
        movePowerup 30s linear infinite,
        scalePowerup 30s linear infinite,
        boxShadowPowerup 30s linear infinite;
    animation-play-state: running;
    transform-origin: center center;
    background: #fff;
}

@keyframes movePowerup {
    from { left: 0%; top: 65%; }
    to { left: 100%; top: 35%; }
}

@keyframes scalePowerup {
    0% { transform: scale(.5); }
    27% { transform: scale(.5); }
    33% { transform: scale(1.5); }
    50% { transform: scale(1.5); }
    70% { transform: scale(.5); }
    100% { transform: scale(.5); }
}

@keyframes boxShadowPowerup {
    0% { box-shadow: 0 0 100px 1px rgba(255, 255, 255, 1); }
    27% { box-shadow: 0 0 100px 1px rgba(255, 255, 255, 1); }
    34% { 
        box-shadow: 
            /* larger circle */
            0 0 20px 18px rgba(255, 255, 255, .1),
            0 0 20px 18px rgba(255, 255, 255, 0.05),
            /* Bright circle with hard edge */
            0 0 10px 8px rgba(255, 255, 255, .25),
            0 0 10px 8px rgba(255, 255, 255, 0.2),
            /* Immediate sharp dropoff */
            0 0 15.2px 8px rgba(255, 255, 255, 0.05),
            /* Far-reaching glow */
            0 0 40px 25px rgba(255, 255, 255, 0.05),
            0 0 70px 40px rgba(255, 255, 255, 0.025);
    }
    42%, 59% { 
        box-shadow: 
            /* larger circle */
            0 0 20px 18px rgba(255, 255, 255, .2),
            0 0 20px 18px rgba(255, 255, 255, 0.1),
            /* Bright circle with hard edge */
            0 0 10px 8px rgba(255, 255, 255, .65),
            0 0 10px 8px rgba(255, 255, 255, 0.6),
            /* Immediate sharp dropoff */
            0 0 15.2px 8px rgba(255, 255, 255, 0.05),
            /* Far-reaching glow */
            0 0 40px 25px rgba(255, 255, 255, 0.1),
            0 0 70px 40px rgba(255, 255, 255, 0.05);
    }
    70% { box-shadow: 0 0 100px 1px rgba(255, 255, 255, 1); }
    100% { box-shadow: 0 0 100px 1px rgba(255, 255, 255, 1); }
}