Vanishing welcome message

vanishing-message.css

.vanishing-message {
  position: relative;
}

.vanishing-message img {
  width: 100%;
  height: auto;
  display: block;
}

.vanishing-message .text {
  font-size: 56px;
  font-size: 3.5rem;
  -webkit-transition: all 0.25s ease-in-out;
  -moz-transition: all 0.25s ease-in-out;
  transition: all 0.25s ease-in-out;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-weight: bold;
  padding: 2em;
  text-align: center;
  text-shadow: 0 3px 3px rgba(0, 0, 0, 0.25);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.vanishing-message .text .prelude {
    font-size: 16px;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    display: block;
    font-weight: normal;
    font-style: italic;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.25);
}