.auto-slider{
    position: relative;
    box-sizing: content-box;
    display: inline-block;
    padding: 10px 10px 20px;
    background: #fff;
    width: 100%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 4px;
    box-shadow: 1px 1px 6px rgba(0, 0, 0, 0.4);
}
div#slider { overflow: hidden; }
div#slider figure img { width: 25%; float: left; }
div#slider figure {
    position: relative;
    width: 400%;
    margin: 0;
    left: 0;
    text-align: left;
    font-size: 0;
    animation: 25s sliding ease infinite; 
}
.indicator{
    width: 100%;
    height: 6px;
    background: #e41b17;
    position: absolute;
    bottom: 0;
    animation: indicating 5s ease infinite; 
}
@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;
            }
}