image fit bootstrap code example

Example 1: image responsive bootstrap 4

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

Example 2: fit the image in the carrousel bootstrap

.carousel-inner > .item > img {
  width:640px;
  height:360px;
}

Example 3: bootstrap image size

.top1 {
    height:390px;
    background-color:#FFFFFF;
    margin-top:10px;
    overflow: hidden;
}

.top1 img {
    height:100%;
}