.outer100 {
  width: 100%;
  text-align: center;
}

.chart-center {
  display: inline-block;	
  width: 1260px;
  text-align: center;
}

.content-center {
  display: inline-block;	
  width: 960px;
  text-align: center;
}

.youtube-center {
  display: inline-block;	
  width: 1200px;
  text-align: center;
}