.flex {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  /*border: 2px solid red;*/
}

.item1 {
  width: 350px;
  padding: 0.5%;
  /*height: 50px;*/
  margin: 5px;
  /*border: 2px solid blue;*/
}

.item2 {
  width: 950px;
  padding: 0.5%;
  /*height: 50px;*/
  margin: 5px;
  /*border: 2px solid blue;*/
}

.item3 {
  width: 1300px;
  padding: 0.5%;
  /*height: 50px;*/
  margin: 5px;
  /*border: 2px solid blue;*/
}

.new-string {
  width: 100%;
}