How to hide something in mobile view in responsive design

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At times you have to hide something like a banner or a paragraph of text or a slideshow in mobile view depending on the relative importance of it while designing an html page as a part of responsive design. This can be done with the help of style sheet.
View the sample code below. 

Style sheet

@media only screen and (max-width:600px) {
.hideObject {
display: none!important;
}
.keepObjeect {
display: block!important;
width: auto!important;
max-width: 100%!important;
margin: auto!important;

}
}

HTML code

Normally the image will be shown in all devices irrespective of screen size. But to hide it in mobile use class defined in CSS above. 
<img src="images/banner2.jpg" width="800" height="200" class="keepObject" alt="how to keep image in mobile view" />
<!-- shows the image both in normal view and in small devices like mobile. -->

 <img src="images/banner1.jpg" width="800" height="200" class="hideObject" alt="how to hide image in mobile view" />
<!-- shows the image in normal view and hide in small devices like mobile. -->



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