.flexCenter{
    display: flex;
    justify-content: center;
}
.flexCenter_Center{
    display: flex;
    /*主轴上的对齐方式*/
    justify-content: center;
    /*交叉轴上对其方式*/
    align-items: center;
}
.flexBetween_Center{
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.flexAround_Center{
    display: flex;
    justify-content: space-around;
    align-items: center;
}
.flexStart_Center{
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.flexEnd_Center{
    display: flex;
    justify-content: flex-end;
    align-items: center;
}