body{
  margin:0;
  font-family:system-ui,sans-serif;
  background:#000;
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  height:100vh;
}

.wrapper{
  text-align:center;
  max-width:420px;
}

/* ↓↓↓ upraveno ↓↓↓ */
.cover{
  width:50%;        /* poloviční šířka wrapperu */
  max-width:300px;  /* aby na desktopu nebyla moc velká */
  border-radius:12px;
  margin-bottom:1rem;
}

.btn{
  display:inline-block;
  background:#e91e63;
  color:#fff;
  padding:.8rem 1.6rem;
  border-radius:8px;
  text-decoration:none;
  font-size:1.1rem;
  transition:transform .2s ease;
}

.btn:hover{
  transform:scale(1.04);
}