SOURCE

<div class="body">
  <div class="box">
    <span class="new">
      海外
    </span>
  </div>
</div>

* {
  padding: 0;
  margin: 0;
  border: none;
}

html,
body,
.body {
  height: 100%;
  width: 100%;
  display: flex;
}

.box {
  margin: auto;
}

.new {
  position: relative;
  color: #000000;
  font-size: 18px;
}

.new:after {
  position: absolute;
  right: -20px;
  top: -10px;
  font-size: 10px;
  padding: 2px;
  background: red;
  color: #ffffff;
  content: "新";
}