body {
    width: 90%;
	max-width: 800px;
	margin: auto;
}

@media (min-width:640px) {
    body {
        background-color: #eaf6ff;
    }
}

@media (max-width: 500px) {
    h1 {
        font-size: 1.5rem;
    }
}

@media (min-width: 640px) {
    h1 {
        font-size: 2.5rem;
    }
}

#fixed-size-grid-items aside {
    width: 170px;
    margin: 10px;
}

#fixed-size-grid-items li{
    display: inline-block;
    list-style-type: none;
    font-size: 0.8rem;
}

#fixed-size-grid-items ul {
    padding-left: 0;
}

#stretchable-grid-items li{
    width: 100%;
    display: inline-block;
    list-style-type: none;
}

@media (min-width: 480px){
    #stretchable-grid-items li{	
     width: 49%;
    }
}
@media (min-width: 640px){
    #stretchable-grid-items li{
     width: 24%;
    }
}

#stretchable-grid-items aside{
    margin-left: 10%;
    margin-right: 10%;
    font-size: 0.8rem;
}

#stretchable-grid-items ul{
    padding-left: 0;
    margin-left: -10px;
    margin-right: 10px;
    margin-top: 1rem;
    margin-bottom: 1rem;
}