.footer {
  width: 100%;
  height: 177px;
  line-height: 30px;
  background: #f6f6f6;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-family: "Source Han Sans";
  font-weight: 400;
  font-style: normal;
  font-size: 14px;
  color: #666666FF;
  text-align: center;
}
.demo {
  position: fixed;
  top: 0;
  left: 10px;
  background-color: #1a9deb;
  color: #fff;
  width: 80px;
  height: 80px;
  text-align: center;
  line-height: 80px;
  border-radius: 2px;
  transition: translate 0.3s linear;
  /* animation: flying 40s linear infinite; */
  transform: translate(0, 0);
  cursor: pointer;
  z-index: 10000;
  font-size: 30px;
  display: block;
}