body {
    width: 90%;
    max-width: 800px;
    margin: 0 auto;
}

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

@media (min-width: 640px) {
    h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 500px) {
    h1 {
        font-size: 2.5rem;
    }
}

.grid li {
    display: block;
    width: 25%;
    text-align: center;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.using-inline-block li {
    display: inline-block;
}

.using-inline-block {
    font-size: 0;
}

.using-flex {
    display: flex;
    flex-wrap: wrap;
}

.using-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.using-grid li {
    width: 100%;
}

@media (min-width: 480px) {
    .special-grid li {
        width: 50%;
    }
}

@media (min-width: 640px) {
    .special-grid li {
        width: 25%
    }
}

.special-grid li {
    width: 100%
}

.special-grid aside {
    margin: 10pt;
}

.special-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.grid li {
    display: block;
    text-align: center;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.using-inline-block li {
    display: inline-block;
}

.using-inline-block {
    font-size: 0;
}

.using-flex {
    display: flex;
    flex-wrap: wrap;
}

.special-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.special-grid li {
    width: 100%;
}

.special-grid ul {
    margin-left: -10px;
    margin-right: -10px;
    margin-top: 1rem;
    margin-bottom: 1rem;
}