styles.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  width: 100%;
  height: 100%;
  font-family: 'Open Sans', sans-serif;
  font-weight: 300;
}

#background {
  position: fixed;
  width: 110%;
  height: 110%;

  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  filter: blur(4px);
  z-index: -2;
  top: -5%;
  left: -5%;
  opacity: 0;
  transition: opacity 5s;
}

#overlay {
  position: fixed;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: -1;
  opacity: 0;
  transition: opacity 8s;
}

#input-placeholder {
  position: absolute;
  bottom: 15%;
  left: 50%;
  transform: translate(-50%, 0);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 300;
  font-size: 18px;
  opacity: 0;
  transition: opacity 0.5s;
}

#input-container {
  position: absolute;
  bottom: 15%;
  left: 50%;
  transform: translate(-50%, 0);
  width: 60%;
  opacity: 0;
  border-bottom: 1.5px solid rgba(255, 255, 255, 0.80);
}

#wave {
  position: absolute;
  top: calc(85% - 53.97px);
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.5s;
}

#user-input {
  position: absolute;
  bottom: 15%;
  left: 50%;
  font-weight: 300;
  font-family: 'Open Sans', sans-serif;
  transform: translate(-50%, 0);
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: rgba(255, 255, 255, 0.70);
  font-size: 18px;
  text-align: center;
}

#response-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 50%;
  max-height: 50%;
  text-align: center;
  color: rgba(255, 255, 255, 0.90);
  font-weight: 300;
  font-size: 20px;
  opacity: 0;
  transition: opacity 0.8s;
}

#credits {
  position: absolute;
  bottom: 2%;
  left: 50%;
  transform: translate(-50%, 0);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 300;
  font-size: 10px;
  opacity: 0;
  transition: opacity 5s;
}

a {
  color: white;
  text-decoration: none;
}

.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}


#user-input.fade-out {
  animation: fadeOut 0.5s forwards;
}

#user-input::placeholder {
  color: transparent;
}

@keyframes waveAnimation {
  0% {
    transform: translateX(-50%) scale(0.2);
    opacity: 1;
  }
  100% {
    transform: translateX(-50%) scale(1);
    opacity: 0;
  }
}