body{
    background-color: aqua;
    margin: 0;
   max-width: 1000px;
   
}

iframe#g1{
    width: 500px;
    height: 315px ;
}

iframe#g2{
    width: 45%;
    height: 315px ;
    margin: 0;
}

header {
    text-align: center;
    font-size: 30px;
    color:gray;
    position: relative;
    left: 8%;
    padding: 0;
}

div#d1{
    float: left;
    margin: 30px;
    position: relative;
    top: 20px;
    color: gray;
}

div#d2{
    position: relative;
    top: 65px; 
    right: -160px;
    margin-top: 30px;
    margin-left: 30px;
    color: gray;
    padding: 0;
   
}   



@media only screen and (max-width: 600px) {
    body {
      width: 100%;
      max-width: 600px;
    }

    header{
        width: 80%;
        font-size: 20px;
        left: -10px;
    }

    div#d1{
        width: 50%;
        float: left;
    }
    
    div#d2{
        width: 50%;
        margin: 10px;
       right: 10px;
    }

    iframe#g1{
        width: 200px;
    }
    iframe#g2{
        width: 100%;
    }

  }