<div class="flex-container">

    <!-- flex items -->
    <div class="box" id="one">Box 1</div>
    <div class="box" id="two">Box 2</div>
    <div class="box" id="three">Box 3 Lorem ipsum dolor sit amet, consectetur adipiscing
            elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut
            enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
            aliquip ex ea commodo consequat. Duis aute.</div>
    <div class="box" id="four">Box 4 Lorem ipsum dolor sit amet, consectetur adipiscing
        elit, sed do eiusmod tempor incididunt ut labore et dolore</div>
    <div class="box" id="five">Box 5</div>
</div>

.flex-container{
  display: flex;
}
.box {
    background-color: rgb(204, 172, 66);
    border: 1px solid rgb(131, 105, 21);
    padding: 1em;

    flex-grow: 1;
    flex-shrink: 1;
    flex-basis: 0;

    /* or the shorthand version

     flex: 1 1 0;

    */
}

#three {
    flex: 4 1 0;
}

#four {
    flex: 2 1 0;
}