#newsletter-form{display: flex;}
#newsletter {
  border: 1px solid #ddd;
  background-color: #fff;
  color: #333;
  margin-right:5px;
  line-height:2em;
  font-size:0.9em;
  padding: 5px 15px;
}
#newsletter::placeholder {color:#D0D0D0;}
  .btn-subscribe {
  display: inline-block;
  border: 0;
  background-color: #000;
  color: #fff;
  line-height:1.8em;
  vertical-align: middle;
  font-size:1em;
  font-weight: 500; 
  text-align: center;
  padding: 5px 15px;
}