/* 设置整个页面的基础样式 */
    body{
         background-color: #bdade8;
         /*字体样式*/
         font-family: 'Segoe UI', Tahoma, Geneva, Sans-serif;
         /*通过flex布局，让内容，水平且垂直居中*/
         display:flex;  justify-content:center;  align-items:center;
         height:100vh;
         margin:0;
           }
    h1{
      color: #0277BD;
      text-align:center;
        }