body {
    background-color: #1A2849;
}

.flex-container {
    flex-direction: row;
    justify-content: flex-start;
}


.sample1 div:nth-child(2) {
    flex-basis: 200px;
}

.sample2 div:nth-child(2) {
    flex-basis: 33%;
}

.sample3>* {
    flex-basis: 33%;
}

.sample4>* {
    flex: 0 1 auto;
}