fuse-angular/src/@fuse/components/widget/widget.component.scss

fuse-widget {
    display: block;
    position: relative;
    perspective: 3000px;
    padding: 12px;

    > div {
        position: relative;
        transform-style: preserve-3d;
        transition: transform 1s;
    }

    > .fuse-widget-front {
        display: flex;
        flex-direction: column;
        flex: 1 1 auto;
        position: relative;
        overflow: hidden;
        visibility: visible;
        width: 100%;
        opacity: 1;
        z-index: 10;
        border-radius: 8px;
        transition: transform 0.5s ease-out 0s, visibility 0s ease-in 0.2s, opacity 0s ease-in 0.2s;
        transform: rotateY(0deg);
        backface-visibility: hidden;
        border: 1px solid;
    }

    > .fuse-widget-back {
        display: block;
        position: absolute;
        top: 12px;
        right: 12px;
        bottom: 12px;
        left: 12px;
        overflow: hidden;
        visibility: hidden;
        opacity: 0;
        z-index: 10;
        border-radius: 8px;
        transition: transform 0.5s ease-out 0s, visibility 0s ease-in 0.2s, opacity 0s ease-in 0.2s;
        transform: rotateY(180deg);
        backface-visibility: hidden;
        border: 1px solid;

        [fuseWidgetToggle] {
            position: absolute;
            top: 0;
            right: 0;
        }
    }

    &.flipped {

        > .fuse-widget-front {
            visibility: hidden;
            opacity: 0;
            transform: rotateY(180deg);
        }

        > .fuse-widget-back {
            display: block;
            visibility: visible;
            opacity: 1;
            transform: rotateY(360deg);
        }
    }

    .mat-form-field {

        &.mat-form-field-type-mat-select {

            .mat-form-field-wrapper {
                padding: 16px 0;

                .mat-form-field-infix {
                    border: none;
                    padding: 0;
                }
            }

            .mat-form-field-underline {
                display: none;
            }
        }
    }
}