Bootstrap 4 image thumbnail class

Bootstrap Image thumbnails

In addition to our border-radius utilities, you can use 
.img-thumbnail to give an image a rounded 1px border appearance.

<img src="..." alt="..." class="img-thumbnail">

Image responsive bootstrap 4

<img class="img-fluid" src="" alt=""> //This will make your image responsive

Source: stackoverflow.com

Bootstrap image size

.food1 img {
    width:100%;
    height: 230px;
}

Source: stackoverflow.com

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