.fire {
    animation: burn 1.5s linear infinite alternate;
    -webkit-animation: burn 1.5s linear infinite alternate;
    -moz-animation: burn 1.5s linear infinite alternate;
    -ms-animation: burn 1.5s linear infinite alternate;
}

@keyframes burn {
    from {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .4em #ffae34, .2em -.3em .3em #ec760c, -.2em -.4em .4em #cd4606, .1em -.5em .7em #973716, .1em -.7em .7em #451b0e;
    }

    45% {
        text-shadow: .1em -.2em .5em #fefcc9, .15em 0 .4em #feec85, -.1em -.25em .5em #ffae34, .15em -.45em .5em #ec760c, -.1em -.5em .6em #cd4606, 0 -.8em .6em #973716, .2em -1em .8em #451b0e;
    }

    70% {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .6em #ffae34, .2em -.3em .4em #ec760c, -.2em -.4em .7em #cd4606, .1em -.5em .7em #973716, .1em -.7em .9em #451b0e;
    }

    to {
        text-shadow: -.1em -.2em .6em #fefcc9, -.15em 0 .6em #feec85, .1em -.25em .6em #ffae34, -.15em -.45em .5em #ec760c, .1em -.5em .6em #cd4606, 0 -.8em .6em #973716, -.2em -1em .8em #451b0e;
    }
}

@-webkit-keyframes burn {
    from {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .4em #ffae34, .2em -.3em .3em #ec760c, -.2em -.4em .4em #cd4606, .1em -.5em .7em #973716, .1em -.7em .7em #451b0e;
    }

    45% {
        text-shadow: .1em -.2em .5em #fefcc9, .15em 0 .4em #feec85, -.1em -.25em .5em #ffae34, .15em -.45em .5em #ec760c, -.1em -.5em .6em #cd4606, 0 -.8em .6em #973716, .2em -1em .8em #451b0e;
    }

    70% {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .6em #ffae34, .2em -.3em .4em #ec760c, -.2em -.4em .7em #cd4606, .1em -.5em .7em #973716, .1em -.7em .9em #451b0e;
    }

    to {
        text-shadow: -.1em -.2em .6em #fefcc9, -.15em 0 .6em #feec85, .1em -.25em .6em #ffae34, -.15em -.45em .5em #ec760c, .1em -.5em .6em #cd4606, 0 -.8em .6em #973716, -.2em -1em .8em #451b0e;
    }
}

@-moz-keyframes burn {
    from {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .4em #ffae34, .2em -.3em .3em #ec760c, -.2em -.4em .4em #cd4606, .1em -.5em .7em #973716, .1em -.7em .7em #451b0e;
    }

    45% {
        text-shadow: .1em -.2em .5em #fefcc9, .15em 0 .4em #feec85, -.1em -.25em .5em #ffae34, .15em -.45em .5em #ec760c, -.1em -.5em .6em #cd4606, 0 -.8em .6em #973716, .2em -1em .8em #451b0e;
    }

    70% {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .6em #ffae34, .2em -.3em .4em #ec760c, -.2em -.4em .7em #cd4606, .1em -.5em .7em #973716, .1em -.7em .9em #451b0e;
    }

    to {
        text-shadow: -.1em -.2em .6em #fefcc9, -.15em 0 .6em #feec85, .1em -.25em .6em #ffae34, -.15em -.45em .5em #ec760c, .1em -.5em .6em #cd4606, 0 -.8em .6em #973716, -.2em -1em .8em #451b0e;
    }
}

@-ms-keyframes burn {
    from {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .4em #ffae34, .2em -.3em .3em #ec760c, -.2em -.4em .4em #cd4606, .1em -.5em .7em #973716, .1em -.7em .7em #451b0e;
    }

    45% {
        text-shadow: .1em -.2em .5em #fefcc9, .15em 0 .4em #feec85, -.1em -.25em .5em #ffae34, .15em -.45em .5em #ec760c, -.1em -.5em .6em #cd4606, 0 -.8em .6em #973716, .2em -1em .8em #451b0e;
    }

    70% {
        text-shadow: -.1em 0 .3em #fefcc9, .1em -.1em .3em #feec85, -.2em -.2em .6em #ffae34, .2em -.3em .4em #ec760c, -.2em -.4em .7em #cd4606, .1em -.5em .7em #973716, .1em -.7em .9em #451b0e;
    }

    to {
        text-shadow: -.1em -.2em .6em #fefcc9, -.15em 0 .6em #feec85, .1em -.25em .6em #ffae34, -.15em -.45em .5em #ec760c, .1em -.5em .6em #cd4606, 0 -.8em .6em #973716, -.2em -1em .8em #451b0e;
    }
}