html, body {
  padding: 0;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #424242;
}
.example {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #eceff1;
  font-size: 30px;
}
.example img {
  display: none;
  width: 20rem;
  height: 20rem;
  border-radius: 100%;
  overflow: hidden;
}
.example--showCat img {
  display: block;
}
.example--showCat .example__button {
  display: none;
}
.example__button {
  cursor: pointer;
  padding: .55em .8em;
  border-radius: .3em;
  margin-left: .4em;
  outline: none;
  font-size: .8em;
  background-color: #fff;
  color: #1976d2;
  border: 1px solid #ccc;
}
.example__button:hover {
  background-color: #fafafa;
}
.example__button:active {
  background-color: #f5f5f5;
}