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#dynamic_logo>img {opacity: 0;}
#dynamic_logo{
background: url('圖片') no-repeat calc(100% - 50px) calc(100% - 30px);
width:100%; height: clac(100% - 75px);
background-size: 450px; /*圖片寬or高的最大尺寸*/
z-index:400;
-webkit-transition: none;
-mos-transition: none;
-o-transition: none;
transition: none;}