body{
    margin: 0px;
    padding: 0px;
}

header{
    background-color: aquamarine;
}
header div {
    text-align: center;
    font-size: 2em;
    border-bottom: 1px solid rgb(51, 150, 117);
}

body > div {
    background-color: azure;
    padding-top: 1%;
    padding-bottom: 1%;
    text-align: center;
}

option {
    text-align: center;
}