body {
    background-image: url(bg_2.gif);
}

#principal {
    background-color: #eeeeee;
    border-radius: 10px;
    width: 700px;
    margin: auto;
    box-shadow: 0px 0px 10px rgb(0, 0, 0);
    margin-top: 25px;
}

table img {
    width: 200px;
    margin: 10px;
}

table {
    width: 100%;
    font-family: sans-serif;
}

h3 {
    font-size: 15px;
    text-align: center;
}

ul.curso {
    list-style-type: square;
}

ul.disciplina {
    list-style-type: circle;
    list-style-position: inside;
}