@media screen and (min-width:700px) {
    html {
        display: flex;
        justify-content: center
    }
}

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: 0;
    background-color: transparent
}

img {
    width: 100%;
    height: 100%
}

button:active {
    opacity: .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
}