html - Images losing quality in browser preview -


as can see, problem browser preview of images.

preview

attached original image , screenshot of browser preview website.

my code used display image is:

html 

<div class="pricebox col-lg-6 col-md-6 col-sm-6 col-xs-12 col-ss-12">     <img src="assets/img/preturi/aerobic-nelimitat.png" class="img-pricebox img-responsive" alt=""/> </div>`

css

.pricebox {margin-bottom:35px;} .img-pricebox {width:100%; height:auto;}

the dimensions of images 550px x 200px arranged in col-6 grid, enough display think.

what can improove quality? css solution, maybe specific photoshop rendering configuration?

ps: also, local preview attachement lose little bit of quality.

setting max-width of image to100% solve problem.


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