stylesheet.css

:root {
  --red: #fc5185;
  --gray: #364f6b;
  --light-white: #f0f0f0;
  --blue: #43dde6;
}

*,
*::before,
*::after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

html {
  box-sizing: inherit;
  font-family: "Righteous", cursive;
}

body {
  background: var(--light-white);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  opacity: 0;
  font-size: 5rem;
  margin-bottom: 3rem;
  color: var(--gray);
  text-shadow: 4px 4px var(--red);
}

.start {
  transform: scale(0);
  width: 25%;
  padding: 10px;
  border: none;
  outline: none;
  border-radius: 4px;
  cursor: pointer;
  margin: 0 auto;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: "Righteous", cursive;
  letter-spacing: 2px;
  background: linear-gradient(to right, var(--red) 0%, var(--gray) 100%);
}

/********************************************* START MENU ANIMATION *********************************************/
.menu {
  display: flex;
  flex-direction: column;
}

@keyframes menu {
  from {
    top: 40%;
  }
  to {
    top: 5%;
  }
}

/********************************************* STYLING NEW BUTTONS *********************************************/
.buttons {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}

.btn1,
.btn2 {
  width: 100px;
  height: 30px;
  border: none;
  outline: none;
  border-radius: 4px;
  cursor: pointer;
  padding: 6px;
  color: #fff;
  font-weight: 600;
}

.btn1 {
  background: var(--red);
  font-family: "Righteous", cursive;
  letter-spacing: 2px;
}

.btn1:hover {
  background: #fff;
  color: var(--red);
  transition: 0.5s ease;
}

.btn2 {
  background: var(--gray);
  font-family: "Righteous", cursive;
  letter-spacing: 2px;
}

.btn2:hover {
  background: #fff;
  color: var(--gray);
  transition: 0.5s ease;
}

#btn-icons {
  margin-left: 5px;
}

/********************************************* GAME BOARD *********************************************/
.game {
  position: absolute;
  margin-top: 22rem;
}

.game .board-one {
  position: fixed;
}

.game .cell div {
  background: var(--red);
}

.game div {
  width: 130px;
  height: 130px;
  background: var(--gray);
  margin: 2px;
  transition: 0.3s ease;
  cursor: pointer;
}

.invisible {
  transform: scale(0);
}

/********************************************* RESTART BUTTON ICON *********************************************/
.restart {
  border: none;
  outline: none;
  padding: 10px;
  margin-top: 2rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  background: var(--gray);
  color: var(--light-white);
  font-family: "Righteous", cursive;
  letter-spacing: 2px;
}

#icon {
  margin-left: 5px;
  transition: 0.3s ease;
}

#icon.clicked {
  transition: 0.3s ease;
  animation: rotate 0.5s;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/********************************************* STYLING X AND O *********************************************/
.x,
.o {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 7rem;
  font-weight: bold;
}

.square .x,
.square .o {
  cursor: not-allowed;
}

/********************************************* FORM *********************************************/
.name {
  z-index: 1000;
  top: 28%;
  transform: scale(0);
  position: absolute;
  transition: 0.5s ease;
}

input[type="text"] {
  border: none;
  outline: none;
  padding: 8px;
  width: 100%;
  font-family: "Righteous", cursive;
}

input[type="submit"] {
  border: none;
  outline: none;
  padding: 8px;
  border-radius: 2px;
  cursor: pointer;
  background: var(--gray);
  color: #fff;
  width: 100%;
  font-family: "Righteous", cursive;
}

/******************************************** WHO'S TURN IS IT?  ********************************************/
#player-turn {
  float: right;
  font-size: 0.9rem;
  font-weight: bold;
  margin-top: 2.2rem;
}

/******************************************** LEFT PLAYER INFORMATION ********************************************/
.left-title {
  position: absolute;
  top: 25%;
  left: 10%;
  font-size: 1.5rem;
}

.left-name {
  position: absolute;
  left: 10%;
  top: 30%;
  font-size: 3rem;
}

.left-score {
  position: absolute;
  top: 60%;
  left: 12%;
  font-size: 3.5rem;
}

/******************************************* RIGHT SIDE INFORMATION ********************************************/
.right-title {
  position: absolute;
  top: 25%;
  right: 10%;
  font-size: 1.5rem;
}

.right-name {
  position: absolute;
  right: 10%;
  top: 30%;
  z-index: 100000;
  font-size: 3rem;
}

.right-score {
  position: absolute;
  top: 60%;
  right: 12%;
  font-size: 3.5rem;
}

@media screen and (max-width: 360px) {
  .game-name {
    font-size: 3rem;
  }

  .btn1, .btn2 {
    font-size: 0.6rem;
    width: 90px;
    height:30px;
  }

  .game td div {
    width: 70px;
    height: 70px;
  }

  .restart {
    padding: 5px;
    margin: 0;
  }

  .name {
    top: 20%;
  }

  .start {
    font-size: 0.62rem;
  }

  #x,
  #o {
    font-size: 2rem;
  }

  #left-title {
    position: absolute;
    top: 35%;
    left: 5%;
    font-size: 1rem;
  }
  
  #left-name {
    left: 5%;
    top: 40%;
    font-size: 1.5rem;
  }
  
  #left-score {
    top: 65%;
    left: 2%;
    font-size: 1.5rem;
  }

  #right-title {
    top: 35%;
    right: 5%;
    font-size: 1rem;
  }
  
  #right-name {
    right: 5%;
    top: 40%;
    font-size: 1.5rem;
  }
  
  #right-score {
    position: absolute;
    top: 65%;
    right: 2%;
    font-size: 1.5rem;
  }

  #player-turn {
    margin: 0;
  }
  
}

@media screen and (max-width: 420px) {
  h1 {
    font-size: 4rem;
  }

  .start {
    width: 30%;
  }

  .game {
    margin-top: 18rem;
  }

  #x,
  #o {
    font-size: 2.5rem;
  }

  #player-turn {
    font-size: 0.7rem;
  }

  .restart {
    font-size: 0.7rem;
  }

  .game td div {
    width: 80px;
    height: 80px;
  }

  .left-title {
    left: 5%;
    font-size: 1rem;
  }

  .left-name {
    left: 10%;
    font-size: 2rem;
  }

  .left-score {
    left: 7%;
    font-size: 2rem;
  }

  .right-title {
    right: 5%;
    font-size: 1rem;
  }

  .right-name {
    right: 5%;
    font-size: 2rem;
  }

  .right-score {
    right: 7%;
    font-size: 2rem;
  }
}

@media screen and (max-width: 768px) {
  .game div {
    width: 100px;
    height: 100px;
  }

  .x,
  .o {
    font-size: 6rem;
  }

  .left-title {
    top: 30%;
    left: 5%;
    font-size: 1rem;
  }

  .left-name {
    top: 35%;
    left: 10%;
    font-size: 2rem;
  }

  .left-score {
    left: 7%;
    font-size: 2rem;
  }

  .right-title {
    top: 30%;
    right: 5%;
    font-size: 1rem;
  }

  .right-name {
    top: 35%;
    right: 5%;
    font-size: 2rem;
  }

  .right-score {
    right: 7%;
    font-size: 2rem;
  }
}