edx-platform/lms/static/sass/shared/_modal.scss

#lean_overlay {
  background-image: radial-gradient(circle at 50% 30%, $shadow-d1, $shadow-d2);
  display: none;
  height: 100%;
  left: 0;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
}

.modal {
  @extend %ui-depth1;

  display: none;
  position: absolute;
  left: 50%;
  padding: 8px;
  width: grid-width(5);
  border-radius: 3px;
  box-shadow: 0 0 5px 0 $shadow-d1;
  background: theme-color("dark");
  color: $body-color;

  &.video-modal {
    left: 50%;
    padding: ($baseline/2);
    width: 582px;

    .inner-wrapper {
      background: $black;
      box-shadow: none;
      height: 315px;
      padding: ($baseline/2);
      width: 560px;
    }
  }

  &.home-page-video-modal {
    left: 50%;
    padding: ($baseline/2);
    width: 662px;

    .inner-wrapper {
      background: $black;
      box-shadow: none;
      height: 360px;
      padding: ($baseline/2);
      width: 640px;
    }
  }

  .inner-wrapper {
    @extend %ui-depth1;

    background: $modal-content-bg;
    border-radius: 0;
    border: 1px solid rgba(0, 0, 0, 0.9);
    box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.7);
    overflow: hidden;
    padding-left: ($baseline/2);
    padding-right: ($baseline/2);
    padding-bottom: ($baseline/2);
    position: relative;

    p {
      font-size: 0.9em;
      line-height: 1.4;
    }

    header {
      @extend %ui-depth1;

      margin-bottom: ($baseline*1.5);
      overflow: hidden;
      padding: 28px $baseline 0;
      position: relative;

      &::before {
        content: "";
        display: block;
        height: 400px;
        left: 0;
        margin: 0 auto;
        position: absolute;
        top: -140px;
        width: 100%;
        z-index: 1;
      }

      hr {
        @extend %faded-hr-divider-light;

        border: none;
        margin: 0;
        position: relative;
        z-index: 2;

        &::after {
          @extend %faded-hr-divider;

          bottom: 0;
          content: "";
          display: block;
          position: absolute;
          top: -1px;
        }
      }

      h2 {
        position: relative;
        text-align: center;
        text-shadow: 0 1px rgba(255, 255, 255, 0.4);
        z-index: 2;
      }
    }

    .modal-form-error {
      background: theme-color("danger");
      border: 1px solid rgb(143, 14, 14);
      color: rgb(143, 14, 14);
      display: none;
      margin-bottom: $baseline;
      padding: 12px;
    }

    .notice {
      background: $yellow;
      border: 1px solid darken($yellow, 60%);
      color: darken($yellow, 60%);
      display: none;
      margin-bottom: $baseline;
      padding: 12px;
    }

    .activation-message,
    .message {
      padding: 0 ($baseline*2) ($baseline/2);

      p {
        margin-bottom: ($baseline/2);
      }
    }

    form {
      margin-bottom: 12px;
      padding: 0 ($baseline*2) $baseline;
      position: relative;
      z-index: 2;

      .input-group {
        @include clearfix();

        border-bottom: 1px solid rgb(210, 210, 210);
        box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.6);
        margin-bottom: ($baseline*1.5);
        padding-bottom: ($baseline/2);
      }

      label {
        color: $body-color;

        &.field-error {
          display: block;
          color: #8f0e0e;

          + input,
          + textarea {
            border: 1px solid #ca1111;
            color: #8f0e0e;
          }
        }
      }

      input[type="checkbox"] {
        margin-right: ($baseline/4);
      }

      textarea {
        background: rgb(255, 255, 255);
        display: block;
        height: 45px;
        margin-bottom: $baseline;
        width: 100%;
      }

      input[type="email"],
      input[type="text"],
      input[type="password"] {
        background: theme-color("inverse");
        display: block;
        height: 45px;
        margin-bottom: $baseline;
        width: 100%;
      }

      label.remember-me,
      label.terms-of-service,
      label.honor-code {
        background: rgb(233, 233, 233);
        border: 1px solid rgb(200, 200, 200);
        border-radius: 3px;
        box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.6);
        display: block;
        margin-bottom: $baseline;
        padding: 8px ($baseline/2);

        &:hover,
        &:focus {
          background: rgb(230, 230, 230);
        }

        &.field-error {
          border: 1px solid #ca1111;
        }

        a {
          font-style: italic;
        }
      }

      .citizenship,
      .gender,
      .date-of-birth {
        margin-bottom: $baseline;
        float: left;
        width: flex-grid(4);

        label {
          display: block;
        }

        select {
          box-sizing: border-box;
          width: 100%;
          display: block;
        }
      }

      .citizenship,
      .gender {
        margin-right: flex-gutter();
      }

      .submit {
        padding-top: ($baseline/2);

        input[type="submit"] {
          display: block;
          height: auto;
          margin: 0 auto;
          width: 100%;
          white-space: normal;
        }
      }
    }

    .login-extra {
      position: relative;
      z-index: 2;

      p {
        color: theme-color("secondary");
        font-style: italic;
        text-align: center;

        span {
          color: theme-color("secondary");
          font-style: italic;
        }

        a {
          color: theme-color("secondary");
          font-style: italic;
          text-decoration: underline;

          &:hover,
          &:focus {
            color: $body-color;
          }
        }

        span + a {
          margin-left: ($baseline*0.75);
        }
      }
    }

    .close-modal {
      border-radius: 2px;
      cursor: pointer;
      display: inline-block;
      padding: 10px;
      position: absolute;
      right: 2px;
      top: 0;
      z-index: 100;
      color: theme-color("secondary");
      font: normal 1.2rem/1.2rem $font-family-sans-serif;
      text-align: center;
      text-shadow: 0 1px rgba(255, 255, 255, 0.8);

      @include transition(all 0.15s ease-out 0s);

      &:hover,
      &:focus {
        color: $body-color;
        text-decoration: none;
      }
    }
  }

  #help_wrapper,
  #feedback_form_wrapper,
  .discussion-alert-wrapper {
    padding: 0 ($baseline*1.5) ($baseline*1.5) ($baseline*1.5);

    header {
      margin-bottom: $baseline;
      padding-right: 0;
      padding-left: 0;
    }

    .note {
      font-size: $font-size-sm;
      margin-top: ($baseline/2);
      color: theme-color("secondary");
    }
  }

  .discussion-alert-wrapper button {
    display: block;
    margin: 0 auto;
  }

  .tip {
    font-size: 12px;
    display: block;
    color: theme-color("dark");
  }
}

.leanModal_box {
  @extend .modal;
}

// --------------------

// CASE: language settings
.modal-settings-language {

  // general reset
  .list-input,
  .list-actions {
    @extend %ui-no-list;
  }

  .settings-language-select .select {
    width: 100%;
  }

  .list-input {
    margin-bottom: $baseline;
  }

  .actions-supplemental {
    padding: 0 ($baseline*2) $baseline ($baseline*2);

    .list-actions-item {
      @extend %t-copy-sub1;

      color: $body-color;
      text-align: center;
    }

    .action {
      display: block;
      margin-top: ($baseline/4);
    }
  }
}