:root{
    --font-family-sans-serif: "Helvetica Neue", Helvetica, Arial, "游ゴシック体", "Yu Gothic", YuGothic, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
    --font-family-monospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

body {
    font-family: var(--font-family-sans-serif);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-sans-serif);
}