tr{
    display: table-row;
    vertical-align: inherit;
    unicode-bidi: isolate;
    border-color:beige ;
    border-top-color: white;
    border-right-color: white;
    border-bottom-color: white;
    border-left-color: white;
}

table{
    width: 100;
    border: 1px solid black;
    color: black;
    border-collapse: separate;
    text-indent: initial;
    border-spacing: 2px;
}

td{
    width: 25%;
    text-align: left;
    vertical-align: top;
    border: 1px solid #000;
    border-collapse: collapse;
    padding: 0.3em;
}

a{
    color: blue;
    text-decoration:none; 
}
th{
    width: 25%;
    text-align: left;
    vertical-align: top;
    border: 1px solid #000;
    border-collapse: collapse;
    padding: 0.3em;
}
nav{
    background-color:aquamarine;
    text-align: center;
    padding-bottom: 3px;
    display:block;
    
}
header{

    background-color: aquamarine;
    text-align: center;
}
body{
    background-color: skyblue;
}
main{
    text-align: center;
}