body
{
  font-family:Arial,sans-serif;
}

#mainDiv
{
  width: 800px;
  margin: 0 auto;
  border: 1px solid gray;
  border-radius: 20px;
  padding: 20px;
}

.div1
{
  padding: 10px;
  border: 1px solid blue;
  border-radius: 10px;
  margin-bottom: 20px;
}

.div2
{
  padding: 10px;
  border: 1px solid blue;
  border-radius: 10px;
}

.div2 h2
{
  color:red;
}

.div2 h4
{
  color:blue;
  font-family:'Comic Sans MS', Arial, sans-serif;
  font-size:2em;
}