body {
    background-color: darkslategray;
    background-image: url("flatearth.jpg"); 
    
}

.center{
    text-align: center;
    border: 2px black;
}

#mainhead{
    font-size: 30px ;
    background-color: darkslategray;
    border:5px solid black;
    padding: 15px;
    text-align:center;

}

#header{
    font-size: 20px;
    background-color:darkslategray;
    border:3px solid black;
    padding: 15px;
    text-align:center;
}

#navigation{
    font-family: arial,helvetica, sans-serif;
    text-align: center;
    font-size: 20px;

}

#list{
    font-family: arial,helvetica, sans-serif;
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color:none;
}
#list li{
    float: left;
    border: 2px solid black;
}

#list a{
    font-weight: bold;
    font-size: 20px;
    color: black;
    display: block;
    padding: 8px;
    text-align: center;
    background-color: darkslategray; 
   
} 

#list a:hover{
    color: white;
}
#list a:active{
    color: yellow;
}
#list a:visited{
    color:pink;
}

#content{
    text-align: center;
    font-size: 30px;
    font-family: arial,helvetica, sans-serif;
    color: white;
    background-color:slategray;

}

table{
    border:1px solid black;
    background-color: white;
}
th{
    border: 1px solid black;
}
td{
    border:1px solid black;
}