* 
{
  margin: 0;
  padding: 0;
}

.content
{
  display: -webkit-flex; 
  -webkit-flex-direction: column;
  display: flex;
  flex-direction: column;
  width: 1000px;
  height: 100%;
  justify-content: center;
  margin: 0 auto;
}

.header
{
  font-family: Arial, Helvetica, sans-serif;
  font-size: 50px;
  line-height: 70px;
  color: #000;
}

.canvas
{
  border: 7px solid #000;
  border-radius: 15px;
}