/* 公共的css */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background: #ffffff;
}

a {
  text-decoration: none !important;
}

img,
input,
button {
  vertical-align: middle;
  border: 0 none;
  outline-style: none;
  padding: 0;
}

.flex {
  display: flex;
}

.flex-row {
  flex-direction: row;
}

.flex-col {
  flex-direction: column;
}

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

.flex-row-center {
  justify-content: center;
}

.flex-row-between {
  justify-content: space-between;
}

.flex-row-around {
  justify-content: space-around;
}

.flex-row-start {
  justify-content: flex-start;
}

.flex-row-end {
  justify-content: flex-end;
}

.flex-col-center {
  align-items: center;
}

.flex-col-end {
  align-items: flex-end;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-1 {
  flex: 1;
}