SOURCE

<div class="wrapper">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
    <div class="item">6</div>
    <div class="item">7</div>
</div>

.wrapper{
    display: flex;
    width: 200px;
    height: 100px;
    background: #ddd;
}

.item{
    width: 50px;
    height: 20px;
    background: pink;
}