header {
    width: 100%;
    height: 65px;
    text-align: center;
    background-color:gray;
    font-size: 35pt;
    font-family: Arial;

}
nav {
 width:100%;
 height: 45px;
 text-align:center;
 background-color:lightgrey;
 font-size: 20pt;
 font-family: Arial, Helvetica, sans-serif;
}


nav a{   
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15pt;
    color: black;
    text-decoration: none;
    display: inline-block;
    width:200px;
    height: 50px;
    text-align: center;
    line-height: 50px;
}


nav a:hover{
    background-color: white;

 }

 main {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15pt;
    color: black;
    text-decoration: none;
    width: 650px;
    text-align: center;
    line-height: 50px;
    margin: 0 auto;
 }

 footer {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20pt;
    color: black;
    text-align: center;
    margin: 0 auto;
    background-color: lightgray;
    height: 75px;
    padding-top: 30px;
 }