/*网址导航部分*/
article {
    width: 100%;
    margin-top: 0px auto;
    background:rgb(236, 235, 235);
  
  
}


  h1 {
    
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 10px;
    height: 30px;
    width: 75%;
    line-height: 30px;
    font-weight: 500;
    font-size: 18px;
    text-align: center;
    color: rgb(43, 43, 40);
    letter-spacing: 15px;
    text-shadow: 2px 2px 2px rgb(207, 199, 199);
    border-radius: 30px;
    box-shadow: 2px 2px 5px rgb(245, 245, 240); 
    background-image: linear-gradient(to bottom, rgba(199, 199, 202, 0), rgb(155, 155, 182));
    
 }

ul a {
    display: block;
    margin: 0px auto;
    font-weight: 500;
    width: 100px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    border-radius: 30px;
    color: rgb(8, 8, 8);
    box-shadow: outset 2px 2px 2px rgb(177, 175, 175);
    font-size: 16px;
    text-shadow: 1px 2px 1px rgb(179, 175, 175);
    
}
ul a:hover,.navA a:active {
    background-image: linear-gradient(to bottom, rgba(5, 5, 5, 0.9),rgba(5, 2, 2, 0.6),rgba(0, 0, 0, 0.9));
    box-shadow: outset 1px 1px 1px rgb(10, 10, 10);
    color: rgb(255, 255, 255);
    font-size: 18px;
}
ul {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-around;
    column-width: 100px;
    column-count: 4;
    
}