ul{
    list-style:none;
    display:inline-flex;
}

a{
    border:5px groove violet;
    text-decoration:none;
}

#navbar{
    margin:10px;
    font-size:20px;
    color:;
}

 h1{
     font-family:Raleway; 
     text-align:center;
} 
          
 h2{
                text-align:center;
                font-family:sans-serif; 
     
 }
 h3{
               text-align:center;
               font-family:Monospace;
}
           
 .center{
     display:block;
     margin-left:auto;
     margin-right:auto;
     width:50px;
}
          
 li{
     text-align:center;
}
        <link href="https://fonts.googleapis.com/css2?family=Raleway:wght@100&display=swap" rel="stylesheet">