body{
  font-family:Arial;
  background:#0f0f0f;
  color:#fff;
}

.header{
  display:flex;
  justify-content:space-between;
  padding:15px;
  background:#111;
}

.post-btn{
  background:#ff0055;
  padding:10px;
  color:#fff;
}

.card{
  background:#1a1a1a;
  padding:10px;
  margin:10px;
}