How to inherit styles?

Hello, this problem
There is a block basic .main-block
Which inside has a child img element
and here I set the style to .main-block, respectively, are also applied to the img so here is how to cancel it?
<div class="main-block">
 <img src="path/image.png" alt="img">

CSS code
 -webkit-filter: grayscale(100%); /* Safari 6.0 - 9.0 */
 filter: grayscale(100%);


The fact that I want the background was black and white and the image itself is colored but does not work
June 10th 19 at 16:59
0 answer

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