header {
  font-family: Helvetica;
  font-size: 20px;
  padding: 3px;
}
.div1 {
  
  width: 300px;
  height: 100px;
  border: 1px solid blue;
  border-radius: 10px;
  box-sizing: border-box;
  text-align: center;
  padding: 20px;
}

.div2 {
  width: 300px;
  height: 100px;  
  padding: 30px;
  text-align: center;
  border: 1px dashed red;
  border-radius: 10px;
  box-sizing: border-box;
}
.div3 {
  border: 2px solid green;
  border-radius: 10px;
  font-family: Helvetica;
  margin: 15px 2px;
  width: 250px;
  height: 100px;
  padding: 20px;
  text-align: center;
  box-sizing: border-box;  
  background-color: #FFDEAD;
  /*flex it here*/
  display:flex;
  flex-direction: column;
  flex-wrap: wrap;
  justify-content: center;
}
.div3-child {
  border: 1px solid green;
  background-color: #FFF8DC;
  margin: 10px;
  font-family: Helvetica;
  /*flex commands here */
  display:flex;
  flex-direction: column;
  flex-wrap: wrap;
  justify-content: center;
  
}