Nah, paste ni dekat sebelum/atas  ]]></b:skin>, 


.img-hover{
opacity:1;
-webkit-transition:All 1s ease;
-moz-transition:All 1s ease;
-o-transition:All 1s ease;
}

.img-hover:hover{
opacity:0.4;
}


pastu paste  ni dekat bahagian HTML page awak, lepas publish nanti baru nampak hover dia.
<img class="img-hover" href="URL Gambar here" width="300"/>

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