body * {
    box-sizing: border-box;
    flex-shrink: 0;
}
html,body {
    height:100%;
    margin: 0;
}
body {
    font-family: PingFangSC-Regular, Roboto, Helvetica Neue, Helvetica, Tahoma,
        Arial, PingFang SC-Light, Microsoft YaHei;
}

button {
    margin: 0;
    padding: 0;
    border: 1px solid transparent;
    outline: none;
    background-color: transparent;
}
.navBox {
    position: relative;
    z-index: 2;
}
.psRelative {
    position: relative;
}
:focus-visible {
    outline: none;
}

ul {
    margin: 0;
    padding: 0;
}
li {
    list-style: none;
}

.clearfix::before,
.clearfix:after {
    content: " ";
    display: table;
}

.clearfix::after {
    clear: both;
}

.clearfix {
    *zoom: 1;
}

button:active {
    opacity: 0.6;
}

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

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

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

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

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

.justify-evenly {
    display: flex;
    justify-content: space-evenly;
}

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

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

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

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

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