Add Pulse on CSS

.owl-prev ,.owl-next {          ← classes where you want to add pulse
    /*border: 3px solid #999;*/
    /*border-radius: 30px;*/
    /*background-color: blue;*/
    text-align: center;
    /*display: block;*/
    color: white;
    box-shadow: 0 0 6px black;
    animation: pulsate 2s ease-out infinite; ← Change speed of pulse
}
@-webkit-keyframes pulsate {
    0%   { box-shadow: 0 0 0 black; }
    50%  { box-shadow: 0 0 6px black; } ← Distance of shadow
    100% { box-shadow: 0 0 0 black; }
}