body{
    background-color: rgb(197, 235, 164);
    width: 90%;
}
header{
    background-color: rgb(190, 232, 232);
    padding: 02cqi;
    margin-bottom: 02cm;
    text-align: center;
    font-size: large;
}
main{
    text-align: center;
    width: 90%;
}
main img{
    width: 90%;
}
iframe{
    text-align: center;
}
picture img{
    text-align: center;
}