.pagewrapper {
    max-width: 600px;
    margin: 0 auto;
}
h1 {
    font-size: 32px;
    font-weight: bold;
}
h4 {
    font-size: 18px;
    font-weight: bold;
}
.parent {
    background-color: #ccc;
}
.child {
    width: 100px;
    padding: 10px;
    color: #fff;
    box-sizing: border-box;
    font-size: 42px;
}
.red {
    background-color: red;
}
.green {
    background-color: green;
}
.blue {
    background-color: blue;
}
.orange {
    background-color: orange;
}
.row {
    display: flex;
    flex-direction: row;
}
.row-reverse {
    display: flex;
    flex-direction: row-reverse;
}
.column {
    display: flex;
    flex-direction: column;
}
.column-reverse {
    display: flex;
    flex-direction: column-reverse;
}