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具体的缩放动画css样式如下：

@keyframes bannerScaleChange {  

     50% {

       transform: scale(1.1);

     }

     100% {

       transform: scale(1);

     }

   }

    .banner_top .big_div {

     width: 90%;

     margin: 0 auto;

     height: 400px;

     position: relative;

     margin-top: 30px;

   }

    .banner_top .big_div .headerDScreen {

     position: absolute;

     width: 100%;

     height: 400px;

     background-image: url('../image/habit.imgs/nav-.jpg');

     background-position: center;

     background-size: cover;

     background-repeat: no-repeat;

     animation: bannerScaleChange 8s infinite; 

     z-index: -1;

   }