.how-to-use{padding: 40px 0 0; box-sizing: border-box;}
.how-to-use p { margin: 35px 0; }
.i-slider-wrap {
    padding: 40px 0;
    background: #fff;
    width: 795px;
    margin: 0 auto;
    }
.i-slider-title-wrap {
    font-size: 0;
    text-align: center;
    margin: 20px 0 0 0;
    }
.i-slider-title {
    display: inline-block;
    vertical-align: top;
    text-align: center;
    min-width: 334px;
    font-size: 36px;line-height: 40px;font-family: 'Open Sans', sans-serif;font-weight: 300;
    position: relative;
    }
.i-slider-prev, .i-slider-next {
    position: absolute;
    height: 41px;
    width: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 18px;line-height: 41px;font-family: 'Open Sans', sans-serif;font-weight: 400;
    cursor: pointer;
    top: 50%;
    margin: -20px 0 0;
    -webkit-transition: color 0.3s ease-in;
    -moz-transition: color 0.3s ease-in;
    transition: color 0.3s ease-in;
    }
.i-slider-prev:hover, .i-slider-next:hover {
    color: #777;
    }
.i-slider-prev {
    background: url(../pic/bg-i-slider-prev.png) no-repeat left center;
    text-align: right;
    left: -70px;
    }
.i-slider-next {
    background: url(../pic/bg-i-slider-next.png) no-repeat right center;
    text-align: left;
    right: -70px;
    }
.i-slider-paging {
    padding: 28px 0;
    font-size: 0;
    text-align: center;
    }
.i-slider-paging > a {
    display: inline-block;
    vertical-align: top;
    margin: 0 9px;
    width: 19px;
    height: 19px;
    border-radius: 50%;
    background: #aaaaaa;
    -webkit-transition: background-color 0.3s ease-in;
    -moz-transition: background-color 0.3s ease-in;
    transition: background-color 0.3s ease-in;
    }
.i-slider-paging > a:hover, .i-slider-paging > a.selected {
    background: #3f6fb1;
    }
.i-slider-container {
    padding: 5px 0 40px;
    }
.i-slider {
    position: relative;
    overflow: hidden;
    width: 795px;
    }
.i-slide {
    width: 795px;
    float: left;
    font-size: 18px;line-height: 22px;font-family: 'Open Sans', sans-serif;font-weight: 300;
    }
.i-slide p {
    margin: 35px 0;
    }
.i-slide p.no-b-mar {
    margin: 35px 0 10px;
    }
.i-slide-pic {
    text-align: center;
    line-height: 1;
    }