alfresco-ng2-components/lib/core/viewer/components/pdfViewer.component.scss

@mixin adf-pdf-viewer-theme($theme) {
    $background: map-get($theme, background);
    $foreground: map-get($theme, foreground);

    .adf-viewer-content-container {
        width: 100%;
    }

    .adf-pdf-viewer {
        width: 100%;
        margin: 0;

        .loader-container {
            display: -webkit-box;      /* OLD - iOS 6-, Safari 3.1-6 */
            display: -moz-box;         /* OLD - Firefox 19- (buggy but mostly works) */
            display: -webkit-flex;     /* NEW - Chrome */
            display: flex;             /* NEW, Spec - Opera 12.1, Firefox 20+ */
            -webkit-box-flex-direction: row;
            -moz-box-flex-direction: row;
            -webkit-flex-direction: row;
            flex-direction: row;
            height:100%;
        }

        &__thumbnails {
            position: relative;
            height: 100%;
            width: 190px;
            background-color: rgba(0, 0, 0, 0.12);
        }

        .thumbnails-template {
            &__container {
                display: flex;
                flex-direction: column;
                height: 100%;
            }

            &__buttons {
                height: 45px;
                justify-content: flex-end;
                align-items: flex-end;
                display: flex;
                color: mat-color($foreground, text, 0.54);
            }
        }

        &__container {
            display: flex; height: 100%;
        }

        &__content {
            flex: 1 1 auto; position: relative;
        }

        .loader-item {
            margin: auto;
            max-height:100px;
            max-width:300px;
        }

        &__toolbar {
            position: absolute;
            bottom: 5px;

            left: 50%;
            transform: translateX(-50%);

            .adf-toolbar .mat-toolbar {
                max-height: 48px;
                background-color: mat-color($background, card);
                border-width: 0;
                border-radius: 2px;
                box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.24), 0 0 2px 0 rgba(0, 0, 0, 0.12);
            }

            &-page-selector {
                padding-left: 10px;
                padding-right: 10px;
                font-size: 14px;

                & > input {
                    border: 1px solid mat-color($foreground, text, 0.07);
                    background-color: mat-color($background, card);
                    color: inherit;
                    font-size: 14px;
                    padding: 0;
                    height: 24px;
                    line-height: 24px;
                    text-align: right;
                    width: 33px;
                    margin-right: 4px;
                    outline-width: 1px;
                    outline-color: gray;
                }
            }
        }
    }
}