body {
    background-color: #617be3;
}

.flex-container {
    flex-flow: row wrap;
}

.sample1 > * {
    order: 0;
}

.sample2 div:nth-child(2) {
    order: 1;
}

.sample2 div:nth-child(4) {
    order: -1;
}

.sample3 div:nth-child(1) {
    order: 1;
}

.sample3 div:nth-child(2) {
    order: 2;
}