<div class="modal show">
  <div class="content">
    <small>현재 감지된 브라우저는?</small>
    <p></p>
  </div>
</div>

.content p {
  font-size: 24px;
  font-weight: bold;
}

/* ------------------- */

@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Pretendard;
  word-break: break-all;
  outline: none;
}

body {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 100vh;
  background: #f7f8fc;
  padding: 1.2rem 0;
}

button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20rem;
  height: 50px;
  margin-top: 1rem;
  font-size: 1.1rem;
  background: #febf00;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.modal {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}

.modal > .content {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 500px;
  width: 85vw;
  height: 100px;
  padding: 24px;
  background: #fff;
  border-radius: 5px;
  transform: translate(-50%, -50%);
}

small {
  color: #444;
}