*{
    padding:0px;
    margin:0px;
    box-sizing: border-box;
}
body{
background-color: rgb(0, 0, 0);
}
header{ background-color: brown;
text-align: center;
font-size: 30px;
font-family: Arial, Helvetica, sans-serif;
}

main{
    background-color: aquamarine;
}
main > p{
    background-color: blueviolet;
}
footer{
    background-color: blue;
}