style.css

@import url("https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;1,300;1,500&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Roboto", sans-serif;
  background: rgb(0, 0, 0, 0.9);
  color: rgb(255, 255, 255, 0.8);
}

/* ****************************** */
/* FIRST SECTION CHOOSE THE PLANE */
.choose-plane {
  position: relative;
  text-align: center;
  height: 100vh;
  overflow-y: hidden;
  visibility: visible;
}
/* JS */
.start-game {
  display: none;
  visibility: hidden;
  transition: all 0.5s linear;
}
/* END JS END */

.text-header {
  padding-top: 15vh;
}
.text-header h1 {
  font-size: 2.5rem;
  letter-spacing: 0.25rem;
  padding-bottom: 0.5rem;
}
.text-header h2 {
  text-transform: uppercase;
  font-size: 1.5rem;
  letter-spacing: 0.2rem;
  padding-bottom: 2rem;
}

.planes {
  margin: 1rem 0.5rem;
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.plane {
  padding: 1rem;
  border: 0.25rem solid rgb(255, 255, 255, 0.8);
  border-radius: 25%;
  cursor: pointer;
  transition: all 0.3s linear;
}
.plane:hover {
  background: rgb(255, 255, 255, 0.8);
  color: rgb(0, 0, 0, 0.9);
  border: 0.25rem solid rgb(0, 0, 0, 0.9);
  transform: scale(1.25);
}
.plane i {
  font-size: 7.5rem;
  margin-bottom: 1.5rem;
}
.plane h2 {
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.25rem;
}
.plane h3 {
  font-size: 1rem;
  letter-spacing: 0.15rem;
  font-style: italic;
  border-top: 0.1rem solid rgb(255, 255, 255, 0.8);
}

.cloud1,
.cloud2,
.cloud3,
.cloud4,
.cloud5 {
  height: 15%;
  width: 10%;
  position: absolute;
  top: 0;
  z-index: -2;
}
.cloud6,
.cloud7,
.cloud8,
.cloud9 {
  height: 10%;
  width: 6.6%;
  position: absolute;
  top: 0;
  z-index: -2;
}
.cloud1 {
  right: 10%;
  animation: cloud 3s ease infinite;
}
.cloud2 {
  right: 25%;
  animation: cloud 3s ease infinite 2s;
}
.cloud3 {
  right: 50%;
  animation: cloud 3s ease infinite 0.5s;
}
.cloud4 {
  right: 70%;
  animation: cloud 3s ease infinite 2.5s;
}
.cloud5 {
  right: 82%;
  animation: cloud 3s ease infinite 1s;
}
.cloud6 {
  right: 35%;
  animation: cloud 3s ease infinite 0.25s;
}
.cloud7 {
  right: 60%;
  animation: cloud 3s ease infinite 1.35s;
}
.cloud8 {
  right: 0%;
  animation: cloud 3s ease infinite 2.1s;
}
.cloud9 {
  right: 95%;
  animation: cloud 3s ease infinite 2.75s;
}

@keyframes cloud {
  from {
    top: 0;
  }
  to {
    top: 150%;
  }
}

/* ******** */
/* GAME WEB */
.game {
  position: absolute;
  top: 0;
  left: 0;
  text-align: center;
  height: 100vh;
  overflow-y: hidden;
  visibility: hidden;
  display: none;
}

/* JS */
.game-play {
  visibility: visible;
  display: block;
}
/* END JS END */

.border-game {
  display: flex;
  flex-wrap: wrap;
  width: 100vw;
  height: 100vh;
  border: 1vw solid rgb(255, 255, 255, 0.8);
}
.border-game div {
  width: 5%;
  height: 10%;
}

.game-plane {
  position: absolute;
  bottom: 15%;
  left: 50%;
  transform: translate(-50%, -15%);
}

/* Object in squares */
.game-plane i {
  font-size: 5vw;
}

.invader {
  background: url("./img/enemy.png") no-repeat;
  background-position: center;
  background-size: cover;
}

/* Kind of your character */
.f16 {
  background: url("./img/f16.png") no-repeat;
  background-position: center;
  background-size: cover;
}
.long-plane {
  background: url("./img/long-plane.png") no-repeat;
  background-position: center;
  background-size: cover;
}
.basic-plane {
  background: url("./img/basic-plane.png") no-repeat;
  background-position: center;
  background-size: cover;
}

.boom {
  background: red;
}

.shoot {
  background: linear-gradient(
    189deg,
    rgb(170, 29, 29) 25%,
    rgb(0, 95, 255) 50%,
    rgb(29, 170, 53) 75%
  );
  border-radius: 50%;
}

/* Win or Defeat */
.win,
.defeat {
  width: 100vw;
  height: 100vh;
  z-index: 999 !important;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: rgba(0, 0, 0, 0.25);
  overflow: hidden;
  display: none;
}
.win_active,
.defeat_active {
  overflow: visible;
  display: block;
}

.one {
  width: 100vw;
  height: 100vh;
  padding: 10.5rem;
  -webkit-box-shadow: inset 0px 0px 35px 20px rgba(255, 255, 255, 1);
  -moz-box-shadow: inset 0px 0px 35px 20px rgba(255, 255, 255, 1);
  box-shadow: inset 0px 0px 35px 20px rgba(255, 255, 255, 1);
  transform: all 0.3s linear;
}
.two {
  margin: 5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  flex-direction: column;
  -webkit-box-shadow: 0px 0px 35px 10px rgba(255, 255, 255, 1);
  -moz-box-shadow: 0px 0px 35px 10px rgba(255, 255, 255, 1);
  box-shadow: 0px 0px 35px 10px rgba(255, 255, 255, 1);
  cursor: pointer;
  transition: all 0.3s linear;
}
.two:hover {
  transform: scale(1.25);
  border-radius: 10%;
}
.two h1 {
  font-size: 1rem;
  padding: 1rem;
  text-align: center;
  letter-spacing: 0.25rem;
  color: rgb(255, 255, 255, 0.8);
  line-height: 2rem;
}