@media screen and (max-width:480px)
   { 


#hello{
    display: flex;   
    flex-direction: column-reverse;  
}

div{
    font-size: 3em;
    text-align: center;
}
 #h{
     display: none;
 }

 #l2{
     display: none;
 }

   }

body{
    margin:0
}

#hello{
    display: flex;   
}

div{
    font-size: 4em;
    text-align: center;
    flex-grow: 1;
}

#h{
    background-color:green;
}

#e{
    background-color: red;
}

#l{
    background-color: yellow;
}

#l2{
    background-color: green;
}

#o{
    background-color: red;
}