framework/ember/app/styles/flarum/modals.less

// ------------------------------------
// Modals

.modal-backdrop {
  background-color: @fl-primary-color;
  &.in {
    opacity: 0.9;
  }
}
.modal-dialog {
  margin: 120px auto;

  & .close {
    position: absolute;
    right: 5px;
    top: 5px;
  }
}
.modal-content {
  border: 0;
  border-radius: @border-radius-base;
  .box-shadow(0 7px 15px @fl-shadow-color);
}
.modal-sm {
  width: 375px;
}

.modal-header {
  text-align: center;
  border: 0;
  padding: 25px;

  & h3 {
    font-size: 22px;
    margin: 0;
  }
}
.modal-body {
  background-color: @fl-secondary-color;
  padding: 25px;

  & .form-control {
    background-color: #fff;
  }
}
.modal-footer {
  border: 0;
  padding: 20px;
  text-align: center;
  color: @fl-body-muted-color;
}

.modal-loading {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  opacity: 0;
  pointer-events: none;
  border-radius: @border-radius-base;
  .transition(opacity 0.2s);

  &.active {
    opacity: 1;
    pointer-events: auto;
  }
}

.form-centered {
  text-align: center;

  & .form-control, & .btn {
    width: 220px;
    margin: 0 auto;
    text-align: center;
  }
}