/* 清除默认样式 */
* {
  margin: 0;
  padding: 0;
}
body {
  /* background-color: #f3f5f7; */
}

/* 清除ul li默认样式 */
ul,
li {
  list-style: none;
}

/* 公共样式 */
.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

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

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

.ml-1{
  margin-left: 10px;
}

.mr-1{
  margin-right: 10px;
}

.ml-2{
  margin-left: 20px;
}

.mr-2{
  margin-right: 20px;
}