html{
    background-color:dodgerblue;
    background-repeat:no-repeat;
    background-position:center center;
    background-attachment:fixed;
    background-size:cover;
}

header{
    background-color:yellow;
    color:black;
    text-align:center;
}

body{
    background-color:yellow;
}

h1{
    font-size:48px;
}

ul{
    font-size:24px;
}