body{
    font-family: sans-serif;
    font-size: 1.25rem;
}
main{
    margin: auto;
    padding: 1rem;
}

b{
    font-weight: 800;
}

header, footer{
    text-align:center;
    padding-bottom: 2rem;
}

@media (min-width: 700px){
    main{
       max-width: 55rem;
    }
}

.img-small{
    max-width: 250px;
}
.img-big{
    max-width: 300px;
}