停止引导轮播以缩放图像

Question

我有一个带有一些css的bootstrap轮播，可以将高度保持在500px。当我上传图像并在旋转木马中显示时，它会与旋转木马一起缩放。它伸展，看起来不太好。它像100x100图像或64x64甚至。我怎么能这样做，所以我的图像不会伸展，但保持相同的大小，无论是不扩大规模。

CSS：

.carousel-inner > .carousel-item > img {
    top: 0;
    left: 0;
    min-width: 100%;
    height: 500px;
    max-width: none;
}

传送带

<div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
        <ol class="carousel-indicators">
            @for ($i = 0; $i < count($tool->images); $i++)
                @if($i == 0)
                    <li data-target="#carouselExampleIndicators" data-slide-to="{{$i}}" class="active"></li>
                @else
                    <li data-target="#carouselExampleIndicators" data-slide-to="{{$i}}"></li>
                @endif
            @endfor
        </ol>


        <div class="carousel-inner">
            @for ($i = 0; $i < count($tool->images); $i++)
                @if($i == 0)
                    <div class="carousel-item active">
                        <img class="d-block w-100" src="data:image/jpeg;base64, {{ base64_encode($tool->images[$i]->bytes) }}"/>
                    </div>
                @else
                    <div class="carousel-item">
                        <img class="-block w-100" src="data:image/jpeg;base64, {{ base64_encode($tool->images[$i]->bytes) }}"/>
                    </div>
                @endif
            @endfor
        </div>
        <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>

    </div>