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With smooth effect ( the familiar effect in Jquery), this box can be used instead for the tip "put code in a frame"that I have published for a long time.
2.Next, add this CSS code before the tag :
#dvt{width: 200px;height: 100px;border: solid 1px black;background-color:LightGrey;text-align:center; display:none;}
3.Finally ,create a HTML/JavaScript then add this code or you can add it to your entry too :
Look for the red code ,that is the place you need to put text and option the size of the box.
Save and have fun.