element-call/src/Facepile.module.css

.facepile {
  display: flex;
  margin: 0 16px;
}

.facepile .avatar {
  position: relative;
  width: 20px;
  height: 20px;
  border-radius: 20px;
}

.facepile .avatar > * {
  position: absolute;
  left: 0;
  color: #fff;
  text-align: center;
  pointer-events: none;
  font-weight: 600;
}

.facepile .avatar span {
  font-size: 14px;
  width: 20px;
  line-height: 20px;
}