*{
    margin: 0px;
    padding: 0px;
    text-decoration: none;
}
.Introuduce{
    border: 1px solid black;
    width: 50%;
    height: 350px;

    margin: 10px;
}
.IntrouducePre{
    size: 50px;
}
.ind{
    padding: 5px;
}