body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body p {
  margin: 0;
  padding: 0;
}

.index-main {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  position: relative;
}

.index-back {
  width: 100%;
  left: 0;
  top: 0;
  z-index: 1;
}

.index-back img {
  width: 100%;
  display: flex;
}

.eighteen img {
  z-index: 3;
  height: 5vw;
  margin-top: 10vw;
  position: absolute;
  display: block;
  right: 0px;
}

.mod1_store_list .apple {
  z-index: 3;
  height: 4vw;
  position: absolute;
  display: block;
  margin-top: 45vw;
  left: 35%;
}

.mod1_store_list .google {
  z-index: 3;
  height: 4vw;
  position: absolute;
  display: block;
  margin-top: 45vw;
  right: 37%;
}

footer {
  width: 100%;
  padding: 20px 0;
  background-color: #000000;
  color: #ffffff;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

.text-center {
  text-align: center;
}

footer p {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
}

footer a {
  color: #336df4;
  text-decoration: underline;
  /* 添加下划线 */
}

.col-12 {
  -ms-flex: 0 0 100%;
  flex: 0 0 100%;
  max-width: 100%;
}

@media (min-width: 768px) {
  .col-md-8 {
    flex: 0 0 66.666667%;
    max-width: 66.666667%;
  }

  .col-md-2 {
    flex: 0 0 16.666667%;
    max-width: 16.666667%;
  }
}