iframe {
    width: 90%;
    height: 400px;
    border: 1px solid #ccc;
    margin-left: 50px;
}

.sec_sem1 #container1{

    width: 70%;
    
  
  }
  
  .sec_sem1 #container2{
  
    width: 30%;
    display: block;
    justify-content: center; 

  
  }
  #img{

    padding: 200px  0;
    background-image: url(../img/4.jpeg);

  }