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.submit_img /*替換按鈕圖片網址（平常時）*/
{
background: transparent url(圖片網址) no-repeat scroll top left;
height: 96px;
padding-left: 0px;
width: 96px;
overflow: hidden;
margin-top: -10px;
font-size: 0px; /*字體大小*/
transition: 0.3s
}


.submit_img:hover /*替換按鈕圖片網址（滑鼠移上時）*/
{
background: transparent url(圖片網址) no-repeat scroll top left;
height: 96px;
padding-left: 0px;
width: 96px;
margin-top: -10px;
overflow: hidden;
font-size: 0px; /*字體大小*/
transition: 0.5s
}