body{
    max-width: 800px;
    margin: auto
}

h1{
    font-size: 1.5rem;
}

#stretchable-grid-items li{
    width: 100%;
}

@media (min-width: 480px){

    #stretchable-grid-items li{
    width: 50%;
    }

}

@media (min-width: 640px){

    html{
        background-color: #eaf6ff;;
    }

    h1{
        font-size: 2.5rem;
    }   

    #stretchable-grid-items li{
    width: 25%;
    }

}

ul{
    display: flex;
    flex-wrap: wrap;
    padding-left: 0%;
    list-style: none;
   
}

.grid aside{
    width: 170px;
    margin: 10px;
    font-size: 0.8rem;
    
}

#stretchable-grid-items ul{
    display: flex;
    flex-wrap: wrap;
    padding-left: 0%;
    list-style: none;
    margin: 1rem -10px 1rem -10px;
}

#stretchable-grid-items aside{
    margin: 10px;
}