.ball-scale{text-indent:-9999em;background:#6d7373;border-radius:100%;width:40px;height:40px;margin:-20px 0 0 -20px;animation:1s ease-in-out infinite ball-scale;display:inline-block;position:absolute;top:50%;left:50%}@keyframes ball-scale{0%{opacity:1;transform:scale(0)}to{opacity:0;transform:scale(1)}}