<div class="container">
  <img src="https://assets.codepen.io/221808/unilogo-pink.svg" width="150" height="150" class="logo" alt="UNI" />
  <p>にゃあと鳴く声。そこに彼はいた</p>
</div>

.container {
  display: grid;
  place-items: center;
  place-content: center;
}

/* その他のスタイル */

html,
body {
  background-color: hsl(324deg, 90%, 95%);
  height: 100%;
}

body {
  color: hsl(324deg 78% 48%);
  font-family: "游ゴシック Medium", YuGothic, YuGothicM,
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}

p {
  font-size: 20px;
}

.container {
  height: 100%;
  gap: 24px;
}