<ul class="flow">
  <li>
    <span class="icon">01</span>
    <dl>
      <dt>ご応募</dt>
      <dd>エントリーフォームに入力のうえ、ご応募ください。</dd>
    </dl>
  </li>

  <li>
    <span class="icon">02</span>
    <dl>
      <dt>書類選考</dt>
      <dd>書類選考を通過した方には、追ってご連絡いたします。</dd>
    </dl>
  </li>

  <li>
    <span class="icon">03</span>
    <dl>
      <dt>面接</dt>
      <dd>人事または事業部責任者との面接を行います。</dd>
    </dl>
  </li>

  <li>
    <span class="icon">04</span>
    <dl>
      <dt>内定</dt>
      <dd>応募から内定までは2週間程度を想定しております。</dd>
    </dl>
  </li>
</ul>

<link href="https://fonts.googleapis.com/css?family=Montserrat&display=swap" rel="stylesheet">
* {
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  margin: 0;
  padding: 0 2vw;
  display: flex;
  justify-content: center;
  align-items: center;
}
ul {
  padding: 0;
}
li {
  list-style-type: none;
}
dd {
  margin-left: 0;
}

.flow {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: space-between;
  -ms-flex-pack: space-between;
  justify-content: space-between;
}
.flow > li {
  -ms-flex-preferred-size: 22%;
  flex-basis: 22%;
}
.flow > li .icon {
  font-family: 'Montserrat', sans-serif;
  font-size: 18px;
  line-height: 50px;
  width: 50px;
  color: #fff;
  background: rgb(107,144,219);
  margin: 0 auto 20px;
  display: block;
  border-radius: 50%;
  text-align: center;
  position: relative;
  letter-spacing: 2px;
}
.flow > li .icon::before {
  content: "";
  border: solid transparent;
  border-width: 8px;
  border-top-color: rgb(107,144,219);
  position: absolute;
  top: calc(100% - 2px);
  left: 50%;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
}
.flow > li dl {
  padding: 30px 20px;
  margin: 0;
  border: 3px solid rgb(107,144,219);
  position: relative;
}
.flow > li:not(:last-child) dl::before {
  content: "";
  width: 14px;
  height: 14px;
  margin-right: 10px;
  display: inline-block;
  border-top: 4px solid rgb(102,213,233);
  border-right: 4px solid rgb(102,213,233);
  position: absolute;
  top: calc(50% - 14px);
  left: 104%;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}
.flow > li dl dt {
  font-size: 20px;
  font-weight: 600;
  color: rgb(107,144,219);
  -ms-flex-preferred-size: 20%;
  flex-basis: 20%;
  margin-bottom: 1vh;
  text-align: center;
}

External CSS

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