style.css

@import url('https://fonts.googleapis.com/css2?family=Baloo+2&family=Codystar&family=Comfortaa:wght@300&family=Moirai+One&family=Noto+Sans:ital,wght@0,200;0,500;1,500&family=Poiret+One&family=Tektur:wght@900&display=swap');

/* style the background container*/
body {
  /* display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center; */
  background-color: black;
  overflow: hidden;
}

/* ---------------- PAGE GRAPHICS & LAYOUT ----------------------------------------------- */
section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(to bottom, #413f42, #2c3639);
}
section .color {
  position: absolute;
  filter: blur(150px);
}
section .color:nth-child(1) {
  top: -350px;
  width: 600px;
  height: 600px;
  background: #1b2430;
}

section .color:nth-child(2) {
  bottom: -150px;
  left: 100px;
  width: 500px;
  height: 500px;
  background: #2c3333;
}
section .color:nth-child(3) {
  bottom: 50px;
  right: 100px;
  width: 300px;
  height: 300px;
  background: #1b2430;
}
.box {
  position: relative;
}
.box .square {
  position: absolute;
  backdrop-filter: blur(20px);
  box-shadow: 0px 5px 10px 5px #526d82;
  background: #353636;
  border-radius: 5px;
  animation: animate 10s linear infinite;
  animation-delay: calc(-1s * var(--i));
}
@keyframes animate {
  0%,
  100% {
    transform: translateY(-40px);
  }
  50% {
    transform: translateY(40px);
  }
}
.box .square:nth-child(1) {
  top: -50px;
  right: -60px;
  width: 100px;
  height: 100px;
}
.box .square:nth-child(2) {
  top: 150px;
  left: -100px;
  width: 120px;
  height: 120px;
  z-index: 2;
}
.box .square:nth-child(3) {
  bottom: 50px;
  right: -60px;
  width: 80px;
  height: 80px;
  z-index: 2;
}
.box .square:nth-child(4) {
  bottom: -80px;
  left: 100px;
  width: 50px;
  height: 50px;
}
.box .square:nth-child(5) {
  top: -80px;
  left: 140px;
  width: 60px;
  height: 60px;
}
.game-box {
  display: flex;
  flex-direction: column;
  position: relative;
  width: 600px;
  min-height: 600px;
  background: #353636;
  align-items: center;
  justify-content: center;
  justify-content: space-evenly;
  border-radius: 5px;
  backdrop-filter: blur(20px);
  box-shadow: 0px 5px 10px 5px #526d82;
  border: 1px solid #27374d;
  border-bottom: 1px solid #2c3333;
  border-right: 1px solid #413f42;
}
.game-content {
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: space-evenly;
}

/* ------------------BUTTONS GRAPHICS------------------------------------------------- */
/* .buttons{
    display: flex;
    align-items: center;
    justify-content: center;
} */
#start {
  margin: 20px;
  width: 200px;
  height: 50px;
  background: #222;
  color: #fff;
  font-family: "Poiret One", cursive;
  position: relative;
  cursor: pointer;
  z-index: 1;
  border-radius: 10px;
}
#start::before {
  content: "";
  width: 208px;
  height: 58px;
  background: #222;
  position: absolute;
  top: -4px;
  left: -4px;
  transition: all 0.35s;
  border-radius: 10px;
  z-index: -1;
  background: linear-gradient(
    45deg,
    #6528f7,
    #a076f9,
    #d7bbf5,
    #ede4ff,
    #b8b5ff,
    #7868e6,
    #440a67
  );
  filter: blur(5px);
  background-size: 1000%;
  animation: amSize 40s linear infinite;
  opacity: 0;
}
#start::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #222;
  border-radius: 10px;
  z-index: -1;
  opacity: 1;
}

#start:hover::before {
  opacity: 1;
}
#start:active::after {
  opacity: 0;
}
#new-game {
  margin: 20px;
  width: 200px;
  height: 50px;
  background: #222;
  color: #fff;
  font-family: "Poiret One", cursive;
  position: relative;
  cursor: pointer;
  z-index: 1;
  border-radius: 10px;
}
#new-game::before {
  content: "";
  width: 208px;
  height: 58px;
  background: #222;
  position: absolute;
  top: -4px;
  left: -4px;
  transition: all 0.35s;
  border-radius: 10px;
  z-index: -1;
  background: linear-gradient(
    45deg,
    #feffde,
    #ddffbc,
    #91c788,
    #52734d,
    #8cba51
  );
  filter: blur(5px);
  background-size: 1000%;
  animation: amSize 40s linear infinite;
  opacity: 0;
}

#new-game::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #222;
  border-radius: 10px;
  z-index: -1;
  opacity: 1;
}

@keyframes amSize {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 1000% 0;
  }
}
#new-game:hover::before {
  opacity: 1;
}
#new-game:active::after {
  opacity: 0;
}

/* -------------------------------------------------------------------------------------------------- */
#game-title {
  margin: 100px;

  color: #fff;
  position: relative;
  font-family: "Moirai One", cursive;
  font-size: 60px;
  text-align: center;
}

.instructions {
  display: flex;
  flex-direction: column;
  background: #414141;
  height: 360px;
  margin: 20px;
  padding-left: 10px;
  padding-right: 10px;
  color: #fff;
  width: 200px;
  flex-wrap: wrap;
  border: 2px solid #313131;
  
  
}
h3 {
  font-family: "Codystar", cursive;
  text-align: center;
}
#score{
  font-family: "Codystar", cursive;
  text-align: center;
}
p {
  font-family: 'Baloo 2', cursive;
  text-align: center;
  
}
ul {
  font-family: 'Baloo 2', cursive;
  
}
/*----------------------------------------------------------------------------------------------------- */

/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
.container {
  width: 200px;
  height: 360px;
  background-color: #393E46;
  position: relative;
  margin: 20px;
  border: 2px solid#222831;
  
}

/* style the 20*20 block element*/
.activity-model {
  width: 20px;
  height: 20px;
  background-color: #BDBDD7;
  border: 0.3px solid #8787A3;
  box-sizing: border-box; /* ? */
  position: absolute;
}
.fixed-model {
  width: 20px;
  height: 20px;
  background-color: #393232;
  border: 0.3px solid #4D4545;
  box-sizing: border-box;
  position: absolute;
}
/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/