a.blinking {

    color:#fff;

    padding:3px 10px;

    border:1px solid #dfdfdf;

-webkit-animation:blink 0.5s ease-in-out infinite alternate;

    -moz-animation:blink 0.5s ease-in-out infinite alternate;

    animation:blink 0.5s ease-in-out infinite alternate;

}

@-webkit-keyframes blink {

    0% {background-color: red;border:1px solid #8e2525}

    100% {color:#000;border:1px solid #dfdfdf}

}

@-moz-keyframes blink {

    0% {background-color: red;border:1px solid #8e2525}

    100% {color:#000;border:1px solid #dfdfdf}

}

@keyframes blink {

    0% {background-color: red;border:1px solid #8e2525}

    100% {color:#000;border:1px solid #dfdfdf}

}

<a href="" class="blinking">예약하기</a>