@-webkit-keyframes ball-beat {
  50% {
    opacity : 0.2;
    -webkit-transform : scale(0.75);
            transform : scale(0.75);
  }
  100% {
    opacity : 1;
    -webkit-transform : scale(1);
            transform : scale(1);
  }
}

@-moz-keyframes ball-beat {
  50% {
    opacity : 0.2;
    -moz-transform : scale(0.75);
         transform : scale(0.75);
  }
  100% {
    opacity : 1;
    -moz-transform : scale(1);
         transform : scale(1);
  }
}

@-o-keyframes ball-beat {
  50% {
    opacity : 0.2;
    -o-transform : scale(0.75);
       transform : scale(0.75);
  }
  100% {
    opacity : 1;
    -o-transform : scale(1);
       transform : scale(1);
  }
}

@keyframes ball-beat {
  50% {
    opacity : 0.2;
    -webkit-transform : scale(0.75);
       -moz-transform : scale(0.75);
         -o-transform : scale(0.75);
            transform : scale(0.75);
  }
  100% {
    opacity : 1;
    -webkit-transform : scale(1);
       -moz-transform : scale(1);
         -o-transform : scale(1);
            transform : scale(1);
  }
}

.ball-beat > div {
  background-color : #55595C;
  width : 15px;
  height : 15px;
  border-radius : 100%;
  margin : 2px;
  -webkit-animation-fill-mode : both;
     -moz-animation-fill-mode : both;
       -o-animation-fill-mode : both;
          animation-fill-mode : both;
  display : inline-block;
  -webkit-animation : ball-beat 0.7s 0s infinite linear;
     -moz-animation : ball-beat 0.7s 0s infinite linear;
       -o-animation : ball-beat 0.7s 0s infinite linear;
          animation : ball-beat 0.7s 0s infinite linear;
}
.ball-beat > div:nth-child(2n-1) {
  -webkit-animation-delay : -0.35s !important;
     -moz-animation-delay : -0.35s !important;
       -o-animation-delay : -0.35s !important;
          animation-delay : -0.35s !important;
}