body {
background-color: #ffffff;
margin-top: 100px;
}
body.exercicios {
margin-top: 0px;
}
div.logo {
background-image: url('licao.jpg');
width: 547px;
height: 103px;
}
div.tudo {
width: 500px;
height: 500px;
position: absolute;
top:50%;
left:50%;
margin-top: -250px;
margin-left: -250px;
}
div.titulo {
font-family: Times;
font-size: 50px;
font-weight: bold;
color: #000066;
text-align: center;
}
div.link {
font-size: 16px;
font-weight: bold;
text-align: center;
border: orange 2px solid;
width: 100px;
border-width: 10px;
border-style: ridge;
}
div.link2 {
font-size: 16px;
font-weight: bold;
text-align: center;
border: orange 2px solid;
width: 245px;
border-width: 10px;
border-style: ridge;
}
p {
text-align: center; 
}
a {
text-decoration: none;
color: blue;
}
a:hover {
color: green;
}
div.license {
color: gray;
font-weight: bold;
font-style: italic;
font-size: 12px;
text-align: center;
}