.hovergallery img{  
  -webkit-transform:scale(0.8); /*Webkit: Scale down image to 0.8x original size*/  
  -moz-transform:scale(0.8); /*Mozilla scale version*/  
  -o-transform:scale(0.8); /*Opera scale version*/  
  -webkit-transition-duration: 0.5s; /*Webkit: Animation duration*/  
  -moz-transition-duration: 0.5s; /*Mozilla duration version*/  
  -o-transition-duration: 0.5s; /*Opera duration version*/  
  opacity: 0.7; /*initial opacity of images*/  
  margin: 0 10px 5px 0; /*margin between images*/  
  }  

  .hovergallery img:hover{  
  -webkit-transform:scale(1.1); /*Webkit: Scale up image to 1.2x original size*/  
  -moz-transform:scale(1.1); /*Mozilla scale version*/  
  -o-transform:scale(1.1); /*Opera scale version*/  
  box-shadow:0px 0px 30px gray; /*CSS3 shadow: 30px blurred shadow all around image*/  
  -webkit-box-shadow:0px 0px 30px gray; /*Safari shadow version*/  
  -moz-box-shadow:0px 0px 30px gray; /*Mozilla shadow version*/  
  opacity: 1;  
  }

<div class="hovergallery">  
  <img src="Ссылка на картинку" />  
  </div>