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<img src="..." class="img-fluid" style="max-width: 100%; height: auto;">
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.top1 {
height:390px;
background-color:#FFFFFF;
margin-top:10px;
overflow: hidden;
}
.top1 img {
height:100%;
}
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$thumbnail-padding: .25rem;
$thumbnail-bg: $body-bg;
$thumbnail-border-width: $border-width;
$thumbnail-border-color: var(--#{$prefix}border-color);
$thumbnail-border-radius: $border-radius;
$thumbnail-box-shadow: $box-shadow-sm;