/* reset rule */
* {
    margin: 0; padding: 0; border: 0; box-sizing: border-box;
}

:root {
    font-size: 62.5%;

    /* css variables */
    --color-primary1: #CCC;
    --color-font1: #222;
    --color-accent1: orangered;

    --size-small: 4px;
    --size-medium1: 8px;
    --size-medium2: 12px;
    --size-large: 16px;
}