Welcome to the Online HTML Colour X-Fader.
Because of the relatively complexity of the interface of this utility a browser supporting frames is necessary (your browser does not seem to support frames). There is still an older version which does not require frames which may be used, but it may not have all the features of the framed version.
You may also, if you wish, still use the framed version without frames. The difference will be that your results will create a new page instead of being displayed in a frame. After your results are displayed, if you want to make any changes you will have to use the "back" function of your browser to return to input form.