.box {
  min-width: 1440px;
  width: 100vw;
  height: 100vh;
  background-color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: calc(100vw / 1920);
  /* 父元素设置字体大小 font-size: calc(100vw / 1920); */
  /* 子元素使用em代替px */
  /* 添加最小媒体查询 */
  /* @media screen and (max-width: 1440px) {
    .box {
        font-size: calc(1440px / 1920);
    }
  } */
}
@media screen and (max-width: 1440px) {
  .box {
    min-width: 1440px;
    width: 100vw;
    height: 100vh;
    background-color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: calc(1440px / 1920);
  }
}
.logo {
  width: 400em;
  height: 80em;
  margin: 20em auto;
}
.content-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: auto;
}
.content-box .weihu-img {
  width: 320em;
}
.content-box .weihu-title {
  font-size: 20em;
  color: #333333;
}
.content-box .weihu-text {
  font-size: 16em;
  color: #666666;
  margin-top: 1em;
}
.bottom-img {
  margin-top: auto;
  width: 100%;
}
@media screen and (max-width: 750px) {
  .box {
    min-width: auto;
    width: 100vw;
    height: 100vh;
    font-size: calc(100vw / 375);
  }
  .logo {
    width: 300em;
    height: 60em;
    margin: 15em auto;
  }
  .content-box .weihu-img {
    width: 180em;
  }
  .content-box .weihu-title {
    font-size: 14em;
    margin: 0 20px;
    text-align: center;
  }
  .content-box .weihu-text {
    font-size: 12em;
    margin-top: 10px;
  }
  .bottom-img {
    width: 100%;
    height: auto;
  }
}