style.scss

body {
  background-image: url("bg.jpg");
  background-size: cover;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

  form {
    text-align: center;
    margin: 30px 0px;

    button {
      display: inline-block;
      padding: 10px 15px;
      font-size: 20px;
      border-radius: 10px;
      line-height: 1;
	  border: 1px solid grey;
	  
      &:focus {
        outline: none;
      }

      &:hover {
        background-color: #efefef;
        cursor: pointer;
      }

      i.material-icons {
        font-size: 15px;
      }
    }
  }

  .card-container {
    overflow: auto;
    max-width: 600px;
    margin: 15vh auto 0 auto;

    .card-back, .card-front {
      width: 50%;
      float: left;
      padding: 10px;
      box-sizing: border-box;
    }

    .card-back {
      img {
        border-radius: 20px;
        width: 100%;
      }
    }

    .card-front #card-top {
      background-color: white;
      border-radius: 20px;
      height: 392px;
      padding: 10px;
      box-sizing: border-box;
      text-align: center;
      opacity: 0.0;

      &.red {
        color: #e24235;
      }

      p.value {
        font-size: 240px;
        line-height: 0;
        margin-top: 140px;
        margin-bottom: 140px;
      }

      img {
        width: 40px;
      }
    }
  }

  .swal-modal.simple-success {
    width: 300px;
    .swal-title {
      margin-bottom: 45px;
    }
  }
}