xo-game-main.css

.page {
  background-image: linear-gradient(to bottom, #011428, #032a54);
  background-image: -webkit-linear-gradient(top, #011428, #032a54);
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  font-family: Arial;
  color: #dfe7f0;
  font-size: 12px;
  margin: 0;
  padding: 0;
  border: 0;
}

.board {
  position: absolute;
  top: 50%;
  margin-top: -45vmin;
  left: 50%;
  margin-left: -45vmin;
}

.board__game {
  min-width: 90vmin;
  height: 90vmin;
  display: table-cell;
  vertical-align: middle;
  text-align: center;
}

.options-frame {
  opacity: 0;
  z-index: -1;
  position: absolute;
  top: 0vmin;
  left: 0vmin;
  min-width: 83vmin;
  min-height: 83vmin;
  margin: 1vmin 5vmin 1vmin 1vmin;
  border: 2px solid #C4AA12;
  border-radius: 7px;
}

.boardgame__start-animation {
  animation-duration: 1s;
  animation-fill-mode: both;
  animation-name: boardgame__keyframes-start-animation;
}

@keyframes boardgame__keyframes-start-animation {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.field__background {
  position: absolute;
  top: 0;
  width: 89vmin;
  height: 90vmin;
  font-family: 'Helvetica', 'Arial', sans-serif;
  font-size: 150vmin;
  line-height: 64vmin;
  text-align: center;
  overflow: hidden;
  color: yellow;
  opacity: 0.07;
  z-index: -1;
  animation-duration: 0.5s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: background__keyframes-fadein;
}

@keyframes background__keyframes-fadein {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.07;
  }
}

.field__background-fadeout {
  animation-duration: 0.5s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: background__keyframes-fadeout;
}

@keyframes background__keyframes-fadeout {
  0% {
    opacity: 0.07;
  }
  100% {
    opacity: 0;
  }
}

.cell {
  border: 2px solid #C4AA12;
  border-radius: 7px;
  width: 26vmin;
  height: 26vmin;
  display: inline-block;
  margin: 1vmin 1vmin 1vmin 1vmin;
  padding: 0;
  font-family: 'Helvetica', 'Arial', sans-serif;
  font-size: 18vmin;
  text-align: center;
  overflow: hidden;
  cursor: default;
}

.cell.custom-cell {
  line-height: 84%;
  margin: 0;
  border: 1px dotted #C4AA12;
  border-radius: 0;
  margin-top: -3px;
  margin-left: -1px;
}

.cell.empty {
  cursor: pointer;
}

.cell.mega-swing,
.options-frame.mega-swing {
  animation-duration: 2s;
  animation-fill-mode: both;
  transform-origin: top center;
  animation-name: mega-swing;
}

@keyframes mega-swing {
  0% {
    transform: rotate(0deg);
  }
  20% {
    transform: rotate(6deg);
  }
  40% {
    transform: rotate(-4deg);
  }
  60% {
    transform: rotate(2deg);
  }
  80% {
    transform: rotate(-2deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

.cell.x-cell {
  color: blue;
}

.cell.o-cell {
  color: yellow;
}

.cell.start-swing {
  animation-duration: 2s;
  animation-fill-mode: both;
  transform-origin: top center;
  animation-name: swing;
}

@keyframes swing {
  0% {
    transform: rotate(0deg);
  }
  15% {
    transform: rotate(3deg);
  }
  40% {
    transform: rotate(-2deg);
  }
  60% {
    transform: rotate(1deg);
  }
  80% {
    transform: rotate(-1deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

.cell-fadeout {
  cursor: default !important;
  animation-duration: 1s;
  animation-fill-mode: both;
  animation-timing-function: linear;
  animation-name: cell-fadeout;
}

@keyframes cell-fadeout {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0.2;
  }
}

.options-button {
  display: inline-block;
  position: absolute;
  cursor: pointer;
  opacity: 0.5;
  z-index: 1;
  border-radius: 5px;
  text-shadow: 2px 2px 2px #666666;
  padding: 7px 12px 7px 12px;
  border: solid #1f628d 1px;
  margin-top: 3vmin;
  margin-left: 6vmin;
}


/****** Animation of the option frame appearance: ******/

.options__is-shown .board__game {
  opacity: 0;
  z-index: -1;
}

.options__is-shown .options-frame {
  opacity: 1;
  z-index: 1;
}

.options__animation-show,
.options__animation-hide {
  animation-duration: 1s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: options__keyframes-flipshow;
}

@keyframes options__keyframes-flipshow {
  0% {
    transform: perspective(400px) rotateX(0deg);
  }
  50% {
    transform: perspective(400px) rotateX(90deg);
  }
  50.1% {
    transform: perspective(400px) rotateX(-90deg);
  }
  100% {
    transform: perspective(400px) rotateX(0deg);
  }
}

.options__animation-show .board__game,
.options__animation-hide .options-frame {
  animation-duration: 1s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: options__keyframes-hide;
}

.options__animation-hide .board__game,
.options__animation-show .options-frame {
  animation-duration: 1s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: options__keyframes-show;
}

@keyframes options__keyframes-hide {
  0% {
    opacity: 1;
  }
  48% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@keyframes options__keyframes-show {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0;
  }
  52% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}


/******** Form ************/

.options-form__fieldset {
  padding: 0;
  margin: 0;
  border: 0;
}

.options-form__control {
  height: 25px;
  padding: 3px 6px;
  font-size: 12px;
  background-color: transparent;
  color: #808E9E;
  border-radius: 4px;
  border: 1px solid rgb(169, 169, 169);
  box-sizing: border-box;
  float: left;
}

.options-form__legend {
  width: 80%;
  padding: 6vmin 0 6px 0;
  margin: auto;
  margin-bottom: 8vmin;
  font-size: 21px;
  color: #6C7A89;
  border: 0;
  border-bottom: 1px solid #0F3C5B;
  text-align: center;
}

.options-form__row {
  margin-bottom: 3vmin;
}

.options-form__row__half {
  width: 41vmin;
  display: table-cell;
  vertical-align: middle;
  padding: 0 9px 0 13px;
}

.options-form__label {
  float: right;
}

.options-form__control option {
  color: #6F7E8D;
  background: #011A35;
}

.options-form__btn {
  float: right;
  cursor: pointer;
  opacity: 0.7;
  z-index: 1;
  border-radius: 5px;
  text-shadow: 2px 2px 2px #666666;
  padding: 7px 12px 7px 12px;
  border: solid #1f628d 1px;
  text-decoration: none;
  background-color: transparent;
  color: #dfe7f0;
}

.options-form__btn.btn-disabled {
  opacity: 0.2;
  cursor: default;
}

.options-form__btn.btn-disabled:hover {
  opacity: 0.2;
}

.options-form__row__half:last-child .options-form__btn {
  float: left;
}

.options-form__row:last-child {
  margin-top: 7vmin;
}


/************** Modal window: *************/

.modal {
  opacity: 0;
  position: fixed;
  z-index: -1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.8);
}

.modal__content {
  background-color: #000000;
  color: #D0D0E0;
  opacity: 0.8;
  margin: 40vh auto;
  padding: 20px;
  border: 1px solid #888;
  border-radius: 7px;
  box-shadow: 0 4px 8px 0 rgba(250, 250, 250, 0.2), 0 6px 20px 0 rgba(250, 250, 250, 0.19);
  width: 50vw;
  text-align: center;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

.modal__animation-show {
  animation-duration: 1.5s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: modal__keyframes-show;
}

@keyframes modal__keyframes-show {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.modal__animation-hide {
  animation-duration: 1.3s;
  animation-fill-mode: both;
  animation-timing-function: ease-in-out;
  animation-name: modal__keyframes-hide;
}

@keyframes modal__keyframes-hide {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}


/****** Mobile adaptation: *******/

@media only screen and (min-width: 840px) {
  .options-button:hover,
  .options-form__btn:hover {
    opacity: 0.85;
  }
}

@media only screen and (max-width: 840px) {
  .options-button:active,
  .options-form__btn:active {
    opacity: 0.85;
  }
}

@media (max-width: 480px) {
  .cell.custom-cell {
    margin-top: -4px;
  }
  .options-form__legend {
    display: none;
  }
  .options-form__row:last-child {
    margin: 10vmin 0 7vmin 0;
  }
  .options-form__row:nth-child(2) {
    margin-top: 7vmin;
  }
}

@media only screen and (max-height: 400px) {
  .options-form__legend {
    display: none;
  }
  .options-form__row:last-child {
    margin: 10vmin 0 7vmin 0;
  }
  .options-form__row:nth-child(2) {
    margin-top: 7vmin;
  }
  .page {
    height: 120vh;
  }
  .options-frame {
    min-width: 95vmin;
  }
  .options-form__row__half {
    width: 46vmin;
  }
}