body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

#app {
  padding: 200px 50px; 
  box-sizing: border-box;
}
#app {
  width: 100%;
  font-size: 10px;

}

a {
  text-decoration: none;
}
.app_top {
  display: flex;
  justify-content: center; /* 水平居中 */
  align-items: center; /* 垂直居中 */
  flex-direction: column; /* 子元素沿垂直方向排列 */
  text-align: center; /* 确保文本也居中 */
}
.app_top .text {
  margin-top: 1em;
}

.app_top .text .tx1 {
  font-size: 2em;
  font-family: PingFang SC, PingFang SC-Bold;
  font-weight: 700;
  text-align: center;
  color: #333333;
}





.container {
  display: flex;
  justify-content: space-around; 
  align-items: center; 
  height: 20vh;
  flex-wrap: wrap;
}
.container img {
  width: 90px;; 
  height: auto;
}