body {
    font-family: 'Montserrat', sans-serif;
    text-align: center;
  }
  
  ul {
    padding-left: 0;
    display: flex;
    flex-flow: row wrap;
  }
  
  li {
    list-style-type: none;
    padding: 10px 10px;
    transition: all 0.3s ease;
  }
  
  .container {
    max-width: 100%;
    padding: 2em;
  }
  
  .card {
    display: block;
    width: 150px;
    height: 175px;
    padding: 80px 50px;
    background-color: #51aae5;
    border-radius: 7px;
    margin: 5px;
    text-align: center;
    line-height: 27px;
    cursor: pointer;
    position: relative;
    color: #fff;
    font-weight: 600;
    font-size: 20px;
    -webkit-box-shadow: 9px 10px 22px -8px rgba(209,193,209,.5);
    -moz-box-shadow: 9px 10px 22px -8px rgba(209,193,209,.5);
    box-shadow: 9px 10px 22px -8px rgba(209,193,209,.5);
    will-change: transform;
  }
  
  li:hover{
    transform: scale(1.1);
  }
  
  li:nth-child(-n+3) .card{
    background-color: #e65f51;
    }
  
  li:nth-child(2n+1) .card{
    background-color: #a17de9;
    }
  
  li:nth-child(4n) .card{
    background-color: #feca34;
    }
  
  li:nth-child(5n-2) .card{
    background-color: #51aae5;
    }
  
  li:nth-child(4n+4) .card{
    background-color: #feca34;
    }
  
  li:nth-child(-7n+7) .card{
    background-color: #e46055;
    }
  
  .delete-card {
    position: absolute;
    right: 0;
    top: 0;
    padding: 10px 15px;
    opacity: .4;
    transition: all 0.5s ease;
  }
  
  .delete-card:hover, .error {
    opacity: 1;
    transform: rotate(360deg);
  }
  
  .flip-enter-active {
    transition: all 0.4s ease;
  }
  
  .flip-leave-active {
    display: none;
  }
  
  .flip-enter, .flip-leave {
    transform: rotateY(180deg);
    opacity: 0;
  
  }
  
  /* Form */
  .flashcard-form{
    position: relative;
  }
  
  
  label{
    font-weight: 400;
    color: #333;
    margin-right: 10px;
  }
  
  input{
    border-radius: 5px;
    border: 2px solid #eaeaea;
    padding: 10px;
    outline: none;
  }
  
  button{
    border-radius: 5px;
    border: 1px solid #87cb84;
    background-color: #87cb84;
    padding: 8px 15px;
    outline: none;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  button:hover{
    background-color: #70a66f;
  }
  
  .error{
    margin-top: 10px;
    display: block;
    color: #e44e42;
    font-weight: 600;
  }