body {
  padding: 0;
  margin: 0;
  background: url(Matrixcode.gif) no-repeat;
  background-size: cover;
}

.enter-screen {
  position: center;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: column;
  justify-content: center;
  align-items: center;
  flex-direction: flex;
  text-align: center;
}

#enter-btn {
  background-color: rgba(197, 11, 11, 0.521);
  color: black;
  padding: 10px 20px;
  font-size: 25px;
  cursor: pointer;
  border: none;
  margin-top: 20px;
  position: center;
}

.enter-screen h1{
  font-size: 40px;
  letter-spacing: 4px;
  font-weight: 100;
  color: rgb(158, 23, 23);
  position: center;
}


.enter-screen p{
  text-align: center;
  font-size: 20px;
  color: rgba(204, 33, 33, 0.795);
  position: center;
}

.enter-screen {
  /* Add transition property */
  transition: opacity 0.5s ease;
  opacity: 1;
}

.enter-screen.fade-out {
  opacity: 0;
}

body {
  background: #000;
  overflow: hidden;
}

button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  color: #000;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 18px;
}

#pageContent {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: #fff;
  font-size: 24px;
}

.hidden {
  display: none;
}

.code-fall {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.code-fall span {
  position: absolute;
  display: block;
  font-family: monospace;
  font-size: 24px;
  color: #fff;
  opacity: 0.1;
  transform: translateY(100%);
  animation: codeFall 10s linear infinite;
}

@keyframes codeFall {
  0% {
    transform: translateY(100%);
  }
  100% {
    transform: translateY(-100%);
  }
}