src/js/components/file-input/style.scss
$height: 30px;
$button-height: 24px;
$button-margin: 3px;
$button-width: 70px;

.file-upload-input {
    outline: none;
    border: none;
    border-radius: 3px;
    box-shadow: 0 0 0 0 rgba(19, 124, 189, 0), 0 0 0 0 rgba(19, 124, 189, 0),
        inset 0 0 0 1px rgba(16, 22, 26, 0.15),
        inset 0 1px 1px rgba(16, 22, 26, 0.2);
    background: #fff;
    height: $height;
    padding: 0 10px;
    vertical-align: middle;
    line-height: $height;
    color: #182026;
    font-size: 14px;
    font-weight: 400;
    transition: box-shadow 0.1s cubic-bezier(0.4, 1, 0.75, 0.9);
    appearance: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    word-wrap: normal;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    padding-right: 80px;
    padding-inline: 0 80px;
    user-select: none;

    &::after {
        min-width: $button-height;
        min-height: $button-height;
        line-height: $button-height;
        margin: $button-margin;
        width: $button-width;

        background-color: #f5f8fa;
        background-image: linear-gradient(
            180deg,
            hsla(0, 0%, 100%, 0.8),
            hsla(0, 0%, 100%, 0)
        );
        color: #182026;
        position: absolute;
        top: 0;
        right: 0;
        border-radius: 3px;
        text-align: center;
        content: 'Browse';
    }

    &:hover::after {
        box-shadow: inset 0 0 0 1px rgba(16, 22, 26, 0.2),
            inset 0 -1px 0 rgba(16, 22, 26, 0.1);
        background-clip: padding-box;
        background-color: #ebf1f5;
    }

    &:active::after {
        box-shadow: inset 0 0 0 1px rgba(16, 22, 26, 0.2),
            inset 0 1px 2px rgba(16, 22, 26, 0.2);
        background-color: #d8e1e8;
        background-image: none;
    }
}

.file-input {
    display: inline-block;
    position: relative;
    cursor: pointer;
    height: $height;

    &.fill {
        width: 100%;
    }

    &.large {
        height: $height + 10;

        .file-upload-input {
            height: $height + 10;
            line-height: $height + 10;
            font-size: 16px;

            &:after {
                min-width: $height;
                min-height: $height;
                line-height: $height;
                margin: $button-margin + 2;
                width: $button-width + 15;
            }
        }
    }

    input {
        opacity: 0;
        margin: 0;
        min-width: 200px;

        &:disabled + .file-upload-input,
        &.disabled + .file-upload-input {
            box-shadow: none;
            background: rgba(206, 217, 224, 0.5);
            cursor: not-allowed;
            color: rgba(92, 112, 128, 0.5);
            resize: none;

            &::after {
                outline: none;
                box-shadow: none;
                background-color: rgba(206, 217, 224, 0.5);
                background-image: none;
                cursor: not-allowed;
                color: rgba(92, 112, 128, 0.5);
            }
        }
    }
}
