.flip-box-front,
.flip-box-back {
    /* position: absolute; */
    width: 100%;
    height: 100%;
    /* -webkit-transform: translate3d(0, 0, 0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden; */
    border-radius: 10px;
}

.flip-box-front {
    background-color: #003349;
}

.flip-box-front .card-img,
.flip-box-back .card-img {
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}

.flip-box-front h6.card-title {
    font-weight: 400!important;
    font-size: 18px!important;
    padding: 1rem!important;
    min-height: 105px!important;
    color: white!important;
}


.flip-box-back {
    background-color: #48BB86;
    color: white;
    display: none;
}

.desc {
    padding: 1rem;
}

.date {
    background-color: #003349;
    color: white!important;
    font-size: 18px!important;
    text-align: center!important;
    width: fit-content;
    position: absolute;
    left: calc(50% - 39px);
    padding: 0.3rem 1rem;
    display: none;
}

.wrap-dropzone{
    position: relative;
}


.line {
    border-bottom: 3px solid #48BB86;
    width: 100%;
    position: absolute;
    z-index: -1;
    top:50%;
}


.img-line{
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
    color: white;
    /* background-color: #48BB86;
    border-radius: 200px; */
    width: 60px;
    height: 60px;
}

.wrap-dates {
    position: absolute;
    top: calc(50% - 30px) ;
    padding:0 2rem;
    display: flex;
    flex-flow: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}
  
  
  main {
     overflow-x: hidden; 
  }
  
  .board {
    width: 100%;
    height: 712px;
    margin: 0 auto;
  }
  
  .tile {
    background-color: #003349;
     width: 250px;
     height: 250px; 
    min-height: 280px;

    /* -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d; */
    display: flex;
    align-items: center;
    justify-content: center;
     margin: 15px auto;
    border-radius: 10px;
    border: 6px solid transparent;
  }
  
  .drag-tile {
    background: #003349;
    box-shadow: 
      0 2px 4px -1px rgba(0,0,0,.2), 
      0 4px 5px 0 rgba(0,0,0,.14), 
      0 1px 10px 0 rgba(0,0,0,.12);
  }
  
  .drop-tile {
    background: white;
    border: 2px dotted #003349;
  }

     .drop-layer {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      grid-column-gap: 6px;
       grid-row-gap:6px;
       padding: 0 3rem;
  }

  
 .drag-layer .tile {
      position: absolute;
      left: 50%;
      margin-left: -125px;
 
 }
  

  .hitting {
    border-color: rgba(255,255,255,0.35);
  }

  .layer .tile.correct .date {
  display: block; 
}

  .correct {
    background: #4caf50;
  }
  
  .wrong {
    background: #c62828;
  }

  .btn-section {
display: flex;
flex-flow: row wrap;
justify-content: center;
position: absolute;
bottom: 0;
left: 50%;
margin-left: -280px;
  }

  .btn {
    padding:1rem 2rem ;
    margin: 12px 0 12px 12px;
    cursor: pointer;
    border: none;
    font-size: 16px;
    line-height: 1.7em;
    font-weight: 500;
  }

  .btn-reset{
    background:#003349 ;
    color:white;
  }
  .btn-reset:hover{
    background: #48BB86;
  }

  .btn-next,
  .btn-check{
    background: #48BB86;
    color:white;
  }
  .btn-next:hover,
  .btn-check:hover{
    background: #003349;
  }

 /*** Responsive Styles Large Desktop And Above ***/
@media all and (min-width: 1405px) {
  
  }
  /*** Responsive Styles Standard Desktop Only ***/
  @media all and (min-width: 1024px) and (max-width: 1405px) {
    .board {
      height: 1028px;
    }
  }

  @media all and (min-width: 981px) and (max-width: 1024px) {
    .board {
      height: 1028px;
    }
  }
  /*** Responsive Styles Tablet And Below ***/
  @media all and (max-width: 980px) {
  
  }
  /*** Responsive Styles Tablet Only ***/
  @media all and (min-width: 768px) and (max-width: 980px) {
    .board {
      height: 1342px;
    }
  
  }
  /*** Responsive Styles Smartphone Only ***/
  @media all and (min-width: 541px) and (max-width: 767px) {
    .board {
      height: 2060px;
    }
  }
  /*** Responsive Styles Smartphone Portrait ***/
  @media all and (min-width: 521px) and (max-width: 540px) {
    .board {
      height: 2075px;
    }
    .btn-section {
      margin-left: -264px;
  }
  }

  @media all and (max-width: 520px) {
    .board {
      height: 2075px;
    }
    .btn-section {
      margin-left: -230px;
  }
  }