<style>
div.container {
    display: flex;
    flex-wrap: nowrap;
    white-space: nowrap;
    overflow:auto;
    height: 100px;
    border: 1px solid gray;
}

div.item {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 200px;
    height: 100px;
    border: 1px solid gray;
}

div.line {
  width: 225px;
  height: 20px;
  border-radius: 10px;
}

.red {
  background-color: rgba(255, 0, 0, 0.85);;
}

.yellow {
  background-color: rgba(255, 255, 0, 0.85);;
}
<style/>
<div class="container">
  <div class="item">
    <div class="line red"></div>
  </div>
  <div class="item">
    <div class="line yellow"></div>
  </div>
  <div class="item">
    <div class="line red"></div>
  </div>
  <div class="item">
    <div class="line yellow"></div>
  </div>
  <div class="item">
    <div class="line red"></div>
  </div>
  <div class="item">
    <div class="line yellow"></div>
  </div>
</div>