html,body{
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  font-family: Consolas, Cascadia Code, NSimSun, serif, sans-serif;
}

a {
  text-decoration: none;
}
a:link {color: #4D4D4D} /* 未访问的链接 */
a:visited {color: #4D4D4D} /* 已访问的链接 */
a:hover {color: #4D4D4D} /* 鼠标移动到链接上 */
a:active {color: #4D4D4D} /* 选定的链接，即鼠标按下去的时候不松开显示的状态 */

#particles-js {
  position: absolute;
  height: 100%;
  width: 100%;
  z-index: -1;
}

.main {
  position: absolute;
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 26px;
}