Resise img in html-css styling

help me please this code
my browser is at 100% zoom. but when test the code it says
" Your image should be 100 pixels wide. Browser zoom should be at 100%."

Your img element should have the class smaller-image .

Your image should be 100 pixels wide. Browser zoom should be at 100%.

Can you show your code? Hard to say what is wrong when we can’t see anything.