html { 
  background-color: #323240;
  background-image: url('background.jpg'); 
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  color: white;
}

div.main {
  margin: auto;
  width: 405px;
  padding: 25px 50px;
  margin-top: 5em;
  background-color: rgba(0, 0, 0, 0.85);
  position: relative;
}

div.main::before {
  content: "Share to Twitter";
  color: white;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -1.5em);
  font-size: 2em;
  font-weight: bold;
  text-shadow: 0 0 3px black, 0 0 7px black, 0 0 10px black;
}

img {
  margin-bottom: 1em;
}

textarea {
  width: 405px;
  padding: 0;
  margin: 0;
  resize: none;
}