body{ 
    background-image: url(lightblue.jpg);
    background-repeat: no-repeat; 
    background-attachment: fixed;
    background-size: cover; 
    margin: 0; 
    margin-top: 15px; 
    margin-bottom: 15px; 
}
header{
    text-align: center; 
    margin: auto;  
}
header a{
    text-decoration: none;
    color: lightsteelblue;
}
h1{
    font-family: sans-serif; 
    color: lightsteelblue; 
    text-align: center;  
}
main{
    font-family: inherit;
    background-color: white ;
    color: grey; 
    width: 1920px; 
    margin: 0 auto; 
}
h3{
    color: darkslategray;
    font-family: sans-serif;
}
table{
    margin: 40px; 
    background: white;
    margin-left: auto;
    margin-right: auto; 
    border-collapse: collapse;
    border: 1px solid lightgrey;
}
td{
    padding: 10px;
    border-left: 1px solid lightgrey;
    border-right: 1px solid lightgrey;
}
tr{
    
}
nav{
    text-align: center; 
    text-decoration: none; 
    background-color: azure; 
}
nav a{
    text-decoration: none; 
    color: powderblue; 
    font-size: 30px; 
    padding-right: 30px;
}
nav a:hover{
    color: lightsteelblue; 
}
.active{
    color: skyblue; 
}
tr a{
    text-decoration: none;
    font-size: 20px;
    color: black;
    font-family: sans-serif; 
}
.center{
    display: block;
    margin-left: auto;
    margin-right: auto;
}
h2{
    text-decoration: none;
    font-family: sans-serif;
    color: skyblue;
    padding: 0px; 
}
footer{
    height: 230px;
    width: 1920px;
    margin: 0 auto; 
    background-color: lightsteelblue;
    font-family: sans-serif;
    text-align: left; 
}
footer p{
    margin-left: 30px; 
}
.Understruket{
    text-decoration: underline;
    font-family: sans-serif;
    color: black;
}
h4{
    font-family: sans-serif;
    font-size: 20px;
    color: darkslategrey; 
    margin-left: 20px;
}