如何使用CSS缩放图像以填充div保持宽高比？

Question

I'd like to fill a div with an img , keeping aspect ratio and stretching either width or height as much as required to fit in.

<div style="width: 80px; height: 80px">
    <img src="..." />
</div>

How could I achieve it? If the image is not quadratic, it must be "zoomed in" and either be scropped top-bottom or left-right, depending which side is the bigger one. Moreover the image should afterwards be centered, so that the corners get cut equally.

I tried (but no effect):

.thumb {
    max-width:100%;
    max-height:100%;
}

If I add additional width: 100%; height:100%; width: 100%; height:100%; , the images fit perfectly, but are resized not keeping aspect ratio .

Answer 1

the following did the trick:

    width:100%;
    height:100%;
    object-fit: cover;
    overflow: hidden;

Answer 2

Using max-width , the image will be contained inside the div , there will be no overflow.

If you use min-width instead, the shorter side will be exactly 100% of the div while the other side can be longer. To center the image, we can use translate and relative positioning .

The following code works.

div {
  overflow: hidden;
} 
.thumb {
  min-width: 100%;
  min-height: 100%;
  transform: translate(-50%, -50%);
  position: relative;
  left: 50%;
  top: 50%;
}

Answer 3

To keep an image's aspect ratio, just specify one dimension:

div {
    width: 80px;
    height: 80px;
    border: 2px solid red;
    overflow: hidden;
}

img {
    height: 100%;
}

This will produce the following effect:

However, as you can see, the kitten is not central, but you can use Flex box to sort this out.

div {
    width: 80px;
    height: 80px;
    border: 2px solid red;
    justify-content: center;
    display: flex;
    flex-direction: row;
}

img {
    flex: 1;
    height: 100%;
}

Answer 4

.thumb {
    max-width:100%;
    height:auto;
}

Or ( to allow scale up and down, which will look pixelated if you scale up, where the above will only scale to the max size of the image )

.thumb {
    width:100%;
    height:auto;
}

Is what you are looking for.

More info on responsive images:

1. http://demosthenes.info/blog/586/CSS-Fluid-Image-Techniques-for-Responsive-Site-Design

2. http://www.w3schools.com/css/css_rwd_images.asp

Answer 5

use background-size:cover

 div{ background-image:url(http://placekitten.com.s3.amazonaws.com/homepage-samples/200/140.jpg); background-size:cover; } 

 <div style="width:80px;height:80px;"></div> 

Answer 6

Not sure if anyone still looking at this post. I came across this while I was looking for a way to fit a image into a < div > without getting the unwanted white space around the image, because I was using hover & stick-out effect. I was inspired by Matt's solution. Instead of

.thumb {
max-width:100%;
height:auto;}

I added

.thumb {
max-width:100%;
max-height:100%;
height:auto;}

Now my images fit in to the < div > perfectly without having those white space stick out with the image.