/* ===============全体=============== */
/* Reset style */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: black;
    list-style: none;
    text-decoration: none;
  }

/* 背景 */
html {
    width: 100%;
    height: 100%;
}

body {
    width: 100%;
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
}