html {
        box-sizing: border-box;
    }

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

    html,
    body {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
    }

    body {
        background: #ffffff url('../img/geometry2.png'); /* Background pattern from Subtle Patterns */
        font-family: 'Coda', cursive;
    }

    .container {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
        flex-direction: column;

    }

    h1 {
        font-family: 'Open Sans', sans-serif;
        font-weight: 300;
    }

    /*
    * Styles for the deck of cards
    */

    .deck {
        width: 660px;
        min-height: 680px;
        background: linear-gradient(160deg, #02ccba 0%, #aa7ecd 100%);
        padding: 32px;
        border-radius: 10px;
        box-shadow: 12px 15px 20px 0 rgba(46, 61, 73, 0.5);
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        margin: 0 0 3em;
    }

    .deck .card {
        height: 125px;
        width: 125px;
        background: #2e3d49;
        font-size: 0;
        color: #ffffff;
        border-radius: 8px;
        cursor: pointer;
        display: flex;
        justify-content: center;
        align-items: center;
        box-shadow: 5px 2px 20px 0 rgba(46, 61, 73, 0.5);
    }

    .deck .card.open {
        transform: rotateY(0);
        background: #02b3e4;
        cursor: default;
    }

    .deck .card.show {
        font-size: 33px;
    }

    .deck .card.match {
        cursor: default;
        background: #02ccba;
        font-size: 33px;
        animation-duration: 0.8s;
        animation-name: bounceIn;

    }

    /*
    * Styles for the Score Panel
    */

    .score-panel {
        text-align: left;
        width: 345px;
        margin-bottom: 10px;
    }

    .score-panel .stars {
        margin: 0;
        padding: 0;
        display: inline-block;
        margin: 0 5px 0 0;
    }

    .score-panel .stars li {
        list-style: none;
        display: inline-block;
    }

    .score-panel .restart {
        float: right;
        cursor: pointer;
    }

    .zoomOut {
        animation-duration: 1s;
        animation-name: zoomOut;
        opacity: 0;
      }
      
      .shake{
        animation-duration: 0.9s;
        animation-name: shake;
      }
    @keyframes zoomOut {
        from {
          opacity: 1;
        }
        50% {
          opacity: 0;
          transform: scale3d(0.3, 0.3, 0.3);
        }
        to {
          opacity: 0;
        }
      }
      
@keyframes shake {
    from, to {
      -webkit-transform: translate3d(0, 0, 0);
      transform: translate3d(0, 0, 0);
    }
    10%, 30%, 50%, 70%, 90% {
      -webkit-transform: translate3d(-10px, 0, 0);
      transform: translate3d(-10px, 0, 0);
    }
    20%, 40%, 60%, 80% {
      -webkit-transform: translate3d(10px, 0, 0);
      transform: translate3d(10px, 0, 0);
    }
  }
  
  @keyframes bounceIn {
    from, 20%, 40%, 60%, 80%, to {
      animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    }
    0% {
      opacity: 0;
      transform: scale3d(0.3, 0.3, 0.3);
    }
    20% {
      transform: scale3d(1.1, 1.1, 1.1);
    }
    40% {
      transform: scale3d(0.9, 0.9, 0.9);
    }
    60% {
      opacity: 1;
      transform: scale3d(1.03, 1.03, 1.03);
    }
    80% {
      transform: scale3d(0.97, 0.97, 0.97);
    }
    to {
      opacity: 1;
      transform: scale3d(1, 1, 1);
    }
  }
  
  .modal {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: scale(1.1);
    transition: visibility 0s linear 0.25s, opacity 0.25s 0s, transform 0.25s;
}
.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    padding: 1rem 1.5rem;
    width: 24rem;
    border-radius: 0.5rem;
}
.close-button {
    float: right;
    width: 1.5rem;
    line-height: 1.5rem;
    text-align: center;
    cursor: pointer;
    border-radius: 0.25rem;
    background-color: lightgray;
}
.close-button:hover {
    background-color: darkgray;
}
.show-modal {
    opacity: 1;
    visibility: visible;
    transform: scale(1.0);
    transition: visibility 0s linear 0s, opacity 0.25s 0s, transform 0.25s;
}
.modal button{
    padding:4px;
    background: red;
    font-size: 20px;
    border: transparent 1px solid;
    border-radius: 10px;
    color:#f4f4f4;

}
.modal button:active{
    transform: scale(1.05)
}