tu-view-plus/es/src/icon/style/icon.css

.tu-icon {
  height: 1em;
  line-height: 1em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  fill: currentColor;
  color: var(--color);
  font-size: var(--tu-font-size-icon, 14px);
  font-style: normal;
  vertical-align: middle;
}
.tu-icon.is-loading {
  animation: rotating 1.8s linear infinite;
}

.tu-icon svg {
  height: 1em;
  width: 1em;
}
.tu-icon__prefix {
  margin-right: 6px;
}

.tu-icon__suffix {
  margin-left: 6px;
}

.tu-icon > * {
  display: inline-block;
  line-height: 1em;
}

@keyframes rotating {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}