.one{
color: black;
background-color:gray;
font-size:30px ;
}
.two{
color: black;
background-color: cadetblue;
font-size: 30px;
}
.three{
color: black;
background-color: cornflowerblue;
font-size: 30px;
}

#main-header{
color: whitesmoke;
background-color: aqua;
font-size: 60px;
}
body{
background-color: lightskyblue;
}