body{
    background-color: black;
    color: white;
}
h1{
    text-align: center;
    color: red;
    font-size: 60px;
}
header{

    height: 200px;
    padding: 20px;
    text-align: center;
}
nav ul{
    border-style:solid;
    border-color:red;
    list-style-type:none;
    background-color:yellow;
}
nav li{
    display:inline;
    margin-left:100px;
}
a{
    color: red;
}
a:visited{
    color: purple;
}
a:hover{
    color: blue;
}
a:active{
    color: white;
}
footer{
    font-size:10px;
    color: powderblue;
}
.content{
    border-style:dotted;
    font-family: serif; 
    font-size: 30px;
    color: orange;
}
#thumbnail{
    height: 150px;
    width: 200px;
}