body * {
    box-sizing: border-box;
}

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;
}

button:active {
    opacity: 0.6;
}

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

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