header {
    background-color:red;
    color: #ffff;
    text-align: center;

}

body{
    background-color: aquamarine;
    font-family: Arial, Helvetica, sans-serif;
    color:black;
}

table, th,td{ 
    width: auto;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid;
    border-collapse:collapse ;
    padding-left: 10px;
    padding-right: 7px;
}

thead{
    background-color: black;
    color: white;
    text-align: center;
}
tbody{
    background-color: cadetblue;
    color: black;
    padding-left: 10px;
    padding-right: 7px;
    text-align: left;
}
a:link{
    color: blue;
    text-align: center;
    text-decoration: none;
}

a:visited{
    color: black;
    text-decoration: none;
}