typing.css

.messages__item--typing {
    will-change: transform;
    width: auto;
    border-top-right-radius: 20px;
    border-top-left-radius: 20px;
    border-bottom-right-radius: 20px;
    padding: 15px 20px;
    display: table;
    margin-right: auto;
    position: relative;
    animation: 2s bulge infinite ease-out;
}

.messages__item--typing::before,
.messages__item--typing::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: -2px;
      height: 10px;
      width: 10px;
      border-radius: 50%;
}
.messages__item--typing::after {
      height: 10px;
      width: 10px;
      left: -10px;
      bottom: -10px;
}
span.messages__dot {
    height: 8px;
    width: 8px;
    float: left;
    margin: 0 1px;
    background-color: #9E9EA1;
    display: block;
    border-radius: 50%;
    opacity: 0.4;
    animation: 1s blink infinite;
}
  
@keyframes blink {
    50% {
        opacity: 1;
    }
}
  
@keyframes bulge {
    50% {
        transform: scale(1.05);
    }
}