.bak{-webkit-transition: all 0.5s;-moz-transition: all 0.5s;-o-transition: all 0.5s;transition: all 0.5s;  display: block; }
.bak:hover {-webkit-transform:scale(1.08); -moz-transform:scale(1.08);-o-transform:scale(1.08);transform:scale(1.08);}
.pic,.pic1{ overflow: hidden; margin: auto; position: relative;}
.pic span{ background-repeat: no-repeat; background-position: center; background-size: cover; display: block;}
.pic span img{position: absolute; width: 100%; height: 100%; top: 0; left: 0; object-fit: cover; transition: all 0.5s;}

.pic1 span{background-repeat: no-repeat; background-position: center; background-size:contain; display: block;}
.pic1 span img{position: absolute; width: 100%; height: 100%; top: 0; left: 0; object-fit: contain; transition: all 0.5s;}