.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 200px;
}

.new-center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width:70%;
}

.container {
  height: 300px;
  width: 70%;
  margin-left:auto;
  margin-right:auto;
  right:0;
  left:0;
}