.gy{
    text-align: center;
    max-width: 800px;
    margin: auto;
    border: 5px solid goldenrod;
    border-radius: 5px;
    list-style-type: none;
    background-color: white;
}
.nb{
    list-style-type: none;
}
.out{
    background-color: greenyellow;
}