.szczesliwe{
    color: whitesmoke;
    height: 300px;
    width: 300px;
    background-color: #404040;
    border:5px solid blue;
    overflow: hidden;
    text-align: center;
    margin: auto;
}
body{
    background-color: #505050;
}
.cos{
    color: royalblue;
}
.zdener{
    color: whitesmoke;
    height: 300px;
    width: 300px;
    background-color: #404040;
    border:5px solid blue;
    overflow: scroll;
    text-align: center;
    margin: auto;
}
a{
color: whitesmoke;
text-decoration: underline;
}