body {
  background-image: url('../static/background/01.jpg');
  /* 设置背景图片重复方式，此处设置为不重复 */
  background-repeat: no-repeat;
  /* 设置背景图片在容器中的铺满方式 */
  background-size: cover;
  /* 设置背景图片居中显示 */
  background-position: center center;
  /* 设置背景图片不滚动 */
  background-attachment: fixed;
  /* 溢出隐藏，不会出现滚动条 */
  overflow: hidden;
  /* 元素不可被选中 */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.card {
  margin: 20px;
  padding: 20px;
  border-radius: 5px;
  overflow: hidden;
  display: inline-block;
  width: 100px;
  height: 100px;
  position: relative;
  background-color: rgba(255, 255, 255, 0.4);
}

a {
  text-decoration: none;
  color: black;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.message-icon {
  display: block;
  width: 80px;
  height: 80px;
}

.font {
  display: flex;
  justify-content: center;
}