body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB,
    Microsoft YaHei, Arial, sans-serif;
  user-select: none;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.flex {
  display: flex;
}
.j-s {
  justify-content: space-between;
}
.j-a {
  justify-content: space-around;
}
.j-c {
  justify-content: center;
}
.a-c {
  align-items: center;
}
.column {
  flex-direction: column;
}

.flex-warp {
  flex-wrap: wrap;
}