.gallery-thumb:hover {
    /* Start the shake animation and make the animation last for 0.5 seconds */
    animation: shake 0.5s;

    /* When the animation is finished, start again */
    animation-iteration-count: infinite;
}

.img-responsive:hover{
    /* Start the shake animation and make the animation last for 0.5 seconds */
        animation: shake 0.5s;
    
        /* When the animation is finished, start again */
        animation-iteration-count: infinite;
}

@keyframes shake {
    0% {
        transform: translate(1px, 1px) rotate(0deg);
    }

    10% {
        transform: translate(-1px, -2px) rotate(-1deg);
    }

    20% {
        transform: translate(-3px, 0px) rotate(1deg);
    }

    30% {
        transform: translate(3px, 2px) rotate(0deg);
    }

    40% {
        transform: translate(1px, -1px) rotate(1deg);
    }

    50% {
        transform: translate(-1px, 2px) rotate(-1deg);
    }

    60% {
        transform: translate(-3px, 1px) rotate(0deg);
    }

    70% {
        transform: translate(3px, 1px) rotate(-1deg);
    }

    80% {
        transform: translate(-1px, -1px) rotate(1deg);
    }

    90% {
        transform: translate(1px, 2px) rotate(0deg);
    }

    100% {
        transform: translate(1px, -2px) rotate(-1deg);
    }
}