.center {
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
}
.demo-container {
    width: 300px;
	height: 150px;
	padding: auto;
	margin: auto;
}
.demo-placeholder {
	width: 100%;
	height: 100%;
    font: 15px arial, sans-serif;
}
.flot-tick-label {
    font: 15px arial, sans-serif;
}