silverstripe-dms/scss/upload.scss

.dmsdocument-addexisting {
  .ui-autocomplete {
    border: 1px solid $color-grey-light;
    max-height: 300px;
    overflow: scroll;
  }
}

.ss-add {
  .document-add-existing {
    input.document-autocomplete {
      position: absolute;
      z-index: 9999;
      width: 390px;
      padding: 9px 7px;
      border-bottom-right-radius: 0;
      border-top-right-radius: 0;
      outline: none;
      box-sizing: border-box;
      -moz-box-sizing: border-box;

      &[disabled] {
        color: $color-grey-light;
        text-shadow: 0 -1px 0 $color-white;
        background: $color-grey-lighter;
        background-image:none;
        box-shadow: inset 0 1px 8px 0 $color-grey-light;
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
      }
    }

    .treedropdown {
      border: none;
    }

    .treedropdownfield-toggle-panel-link {
      padding: 5px 9px 9px;
      background: #fff;
      border: 1px solid $color-cms-input-border;
      float: right;
      z-index: 99999;
      position: relative;

      &.treedropdownfield-open-tree {
        background: #fff;
        border: 1px solid $color-cms-input-border;
        border-bottom:none;
        border-bottom-right-radius:0;
      }
    }

    .treedropdownfield-title {
      width: auto;
    }

    .treedropdownfield-toggle-panel-link a {
      display: inline-block;
      top: 4px;
      position: relative;
    }

    .document-list {
      width: 510px;
      border: 1px solid $color-grey-light;
      border-top: none;
      background: $color-white;
      display: none;
      max-height: 300px;
      background-clip: padding-box;
      overflow: scroll;

      p {
        padding: 10px 10px 0;
      }

      ul {
        padding: 4px 0;

        li {
          line-height: 18px;

          a {
            display: block;
            padding: 4px 8px;
            border: 1px solid $color-white;
            color: black;

            &:hover {
              border: 1px solid $color-grey-light;
              border-radius: 4px;
              background: rgba(203, 203, 203, 0.4);
              cursor: pointer;
              text-decoration: none;
              outline: none;
              text-shadow: none;
            }
          }
        }
      }
    }

    // When inserting a link to a document via the TinyMCE editor
    &.link-editor-context {
      label {
        float: left;
        display: block;
        width: 176px;
        padding: 8px 8px 8px 0;
        line-height: 16px;
        font-weight: bold;
        text-shadow: 1px 1px 0 white;
      }

      .middleColumn {
        input {
          background: white;
          border: 1px solid $color-cms-input-border;
          line-height: 16px;
          border-radius: 4px;
          background-size: 100%;
          max-width: 468px;

          &.document-autocomplete {
            max-width: 365px;
          }
        }
      }

      .document-list {
        width: calc(100% - 2px);
      }
    }
  }

  .ss-assetuploadfield {
    &.link-editor-context {
      label {
        float: left;
        display: block;
        width: 176px;
        padding: 8px 8px 8px 0;
        line-height: 16px;
        font-weight: bold;
        text-shadow: 1px 1px 0 white;
      }

      .middleColumn {
        margin-left: 184px;
        display: block;
        padding: 8px 8px 8px 0;
        font-style: italic;
        min-height: 20px;
      }
    }

    .step4 {
      margin-bottom: 10px;
    }
  }
}

// Styling for tree dropdown field
.cms {
  .ss-add,
  .selectiongroup {
    .treedropdownfield-panel {
      margin: -1px 0 0 0;
      box-sizing: border-box;

      ul {
        padding: 4px 0;

        li {
          border: 1px solid $color-white;

          a {
            display: block;
            padding: 4px 2px;

            &.jstree-hovered {
              background: rgba(203, 203, 203, 0.4);
              border: 1px solid $color-grey-light;
            }
          }
        }
      }
    }
  }
}

#Form_ItemEditForm {
  h3:first-child {
    display: inline-block;
    float: left;
    width: 184px;
  }

  ul.SelectionGroup {
    display: inline-block;
    position: relative;
    padding: 0;
    margin-top: 9px;
    margin-left: 0;
    height: 110px;
    background: none;
    border: none;

    li {
      width: auto;
      clear: none;
      display: inline;
      margin-right: 4px;

      input {
        &.selector {
          display: none;
        }
      }

      label {
        &.ui-button {
          font-weight: bold;
          border: 1px solid #C0C0C2;
          border-radius: 3px;
          padding: 0.8em 1.5em;

          &:hover {
            box-shadow: 0 0 5px rgba(0,0,0,0.3);
          }
        }
      }

      div.field {
        margin-left: 0px;
        margin-bottom: 1em;
        width: 600px;
        position: absolute;
        left: 0;
        margin-top: 13px;
        padding: 10px;
        background: white;
        border: 1px solid $color-cms-input-border;
      }

      &.selected {
        label.ui-button {
          &:after {
            top: 43px;
          }
        }
      }
    }

    .treedropdownfield-panel {
      margin: 1px 0 0 -1px;
      box-sizing: content-box;

      ul {
        li {
          display: block;
          clear: both;
          width: 100%;
          margin: 0;

          li {
            padding-left: 20px;
          }
        }
      }
    }
  }
}