.footer {
  width: 90%;
  height: 1.3rem;
  box-shadow: 0px 0px 0px rgba(0, 0, 0, 0.1);
  background: #333;
  position: fixed;
  bottom: 1rem;
  left: 5%;
  z-index: 1000;
  border-radius: .8rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 .3rem;
  box-sizing: border-box;
}
.footer .icon {
  width: 0.6rem;
  height: .6rem;
}
.header {
  width: 100%;
  height: 1rem;
  display: flex;
  align-items: center;
  padding: 0 .3rem;
  box-sizing: border-box;
  text-align: center;
  background: #fff;
  position: fixed;
  top: 0;
  left: 0;
}
.header .back {
  width: .4rem;
  height: .4rem;
  position: absolute;
  top: .3rem;
  left: .3rem;
}
.header .title {
  font-size: .3rem;
  color: #333;
  flex: 1;
  text-align: center;
}