@import url("https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700,800,900&display=swap");
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background: linear-gradient(#2b1055, #7597de);
}

#section {
  position: relative;
  width: 100%;
  height: 100vh;
  padding: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

#section::before {
  content: "";
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100px;
  background: linear-gradient(to top, #1c0522, transparent);
  z-index: 1000;
}

#section img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

#section img#moon {
  mix-blend-mode: screen;
}

#section img#mountains_front {
  z-index: 10;
}

#text {
  position: absolute;
  right: -350px;
  color: #fff;
  white-space: nowrap;
  font-size: 7.5vw;
  z-index: 9;
}

#btn {
  text-decoration: none;
  display: inline-block;
  padding: 8px 30px;
  border-radius: 40px;
  background: #fff;
  color: #2b1055;
  font-size: 1.5em;
  z-index: 9;
  transform: translateY(100px);
}

.sec {
  position: relative;
  padding: 100px;
  background: #1c0522;
}

.sec h2 {
  font-size: 3.5em;
  margin-bottom: 10px;
  color: #fff;
}

.sec p {
  font-size: 1em;
  color: #fff;
}

.center {
  text-align: center;
}

#btn_game {
  position: relative;
  left: 45%;
  width: 10%;
  display: block;
  padding: 10px 30px;
  border: 2px solid #00aeff;
  text-transform: uppercase;
  font-size: 18px;
  letter-spacing: 4px;
  color: #00aeff;
  text-decoration: none;
  background: #fff;
  overflow: hidden;
}

#btn_game span {
  position: relative;
  z-index: 1;
  transition: 1s;
}

#btn_game .wave {
  position: absolute;
  top: calc(100% + 22px);
  left: 0;
  width: 100%;
  height: 100%;
  background: #00aeff;
  transition: 1s;
}

#btn_game:hover .wave {
  top: 0;
}

#btn_game:hover span {
  color: #fff;
}

#btn_game .wave::before {
  content: "";
  position: absolute;
  top: -22px;
  left: 0;
  width: 100%;
  height: 22px;
  background: url(../img/wave_small.png);
  animation: animate 0.5s linear infinite;
}

@keyframes animate {
  0% {
    background-position-x: 0;
  }
  100% {
    background-position-x: 118px;
  }
}