/* copy from bootstrap*/
.modal {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1060;
  display: none;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  outline: 0;
}
.modal-dialog-centered {
  display: flex;
  align-items: center;
  min-height: calc(100% - 1rem);
}
.mx-sm-3 {
  margin-right: 1rem !important;
  margin-left: 1rem !important;
}
.mb-2 {
  margin-bottom: 0.5rem !important;
}
.btn-dark {
  color: #fff;
  background-color: #212529;
  border-color: #212529;
}
.btn-dark:hover {
  color: #fff;
  background-color: #1c1f23;
  border-color: #1a1e21;
}
.form-control {
  display: block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid #ced4da;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.form-control:focus {
  color: #212529;
  background-color: #fff;
  border-color: #86b7fe;
  outline: 0;
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}
.form-control::-webkit-date-and-time-value {
  height: 1.5em;
}
.form-control::-moz-placeholder {
  color: #6c757d;
  opacity: 1;
}
.form-control::placeholder {
  color: #6c757d;
  opacity: 1;
}
/*end*/

.book {
  display: none;
}

.modal {
  /*background-image: url(https://cn.bing.com/th?id=OHR.OtterCreekVT_EN-CN6409944679_UHD.jpg);*/
  background-size: 100% 100%;
  display: block;
}

.modal form {
  margin: auto;
}

.modal form input {
  min-width: 300px;
  min-height: 40px;
}

.modal form button {
  min-width: 80px;
  min-height: 40px;
  border-radius: 5px;
}