<div class="parent">
    <div class="item-1"></div>
    <div class="item-2"></div>
    <div class="item-3"></div>
</div>
.parent {
    display: flex;
    width: 600px;
}
.parent > div {
    height: 100px;
}
.item-1 {
    width: 140px;
    flex: 2 1 0%;
    background: blue;
}
.item-2 {
    width: 100px;
    flex: 2 1 auto;
    background: darkblue;
}
.item-3 {
    flex: 1 1 200px;
    background: lightblue;
}

External CSS

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External JavaScript

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