<section class="auto-slider">
            <div id="slider">
                <figure>
                    <img src="img/bk-cdu1.jpg" alt="Image">
                    <img src="img/bk-cdu2.jpg" alt="Image">
                    <img src="img/bk-cdu3.jpg" alt="Image">
                    <img src="img/bk-cdu4.jpg" alt="Image">
                    <img src="img/bk-cdu5.jpg" alt="Image">
                    <img src="img/bk-cdu6.jpg" alt="Image">
                    <img src="img/bk-cdu7.jpg" alt="Image">
                </figure>
                <div class="indicator"></div>
    </div>
</section>
	<style>
	.auto-slider{
    position: relative;
    display: inline-block;
    padding: 10px 10px 20px;
    margin: 0 auto;
    overflow: hidden;
    box-shadow: 1px 1px 6px rgba(0, 0, 0, 0.4);
}
@keyframes sliding{
            0%{left: 0%; }
            20%{left: -100%;}
            40%{left: -200%;}
            60%{left: -300%;}
            80%{left: -400%;}
            100%{left: 0%;}
        }                
@keyframes indicating{
            from{
                left: -100%;
            }
            to{
                left: 0;
            }
}  
div#slider { overflow: hidden; }
div#slider figure img { width:25% ; float: left; }
div#slider figure { 
  position: relative;
  width: 100%;
  margin: 0;
  animation: 25s sliding ease infinite; 
}

.indicator{
    width: 100%;
    height: 6px;
    position: absolute;   
    animation: indicating 5s ease infinite; 
}
	</style>