S at the beginning of several style is a new, I m at the beginning of several style was written a few days ago, today to play code found in the HTML file & lt; Div id=jump no new write CSS styles, wrote a few days ago can be normal jump out, while the new style can be written, but run but has no effect, seek the solution, (see image below)

CodePudding user response:

Two CSS file name, not in a folder, is the path to write wrong,