<div class="facebook">
  <span class="f">f</span>
</div>

@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@700&display=swap');


:root {
  --logo-color: #3E74EA;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.facebook {
  background-color: var(--logo-color);
  color: #fff;
  display: inline-block;
  border-radius: 50%;
  text-align: center;
font-family: 'Prompt', sans-serif;
  font-size: 155px;
  width: 150px;
  height: 150px;
  position: relative;
}

.f {
  position: absolute;
  bottom: -44%;
  left: 32%;
}