.cont {
    width: 100%;
    height: 1000px;
    padding: 0 0;
    position: relative;
}
.slider {
    width: 100%;
    height: 1000px;
    position: absolute;
    top: 46%;
    left: 0;
    -webkit-transform: translate(0, -50%);
    -moz-transform: translate(0, -50%);
    -o-transform: translate(0, -50%);
    transform: translate(0, -50%);
    overflow: hidden;
    position: relative;
}
.slider ul, .slider ul li {width: 100%; height: 100%}
.slider ul {
    position: absolute;
    top: 0;
    left: 0
}
.slider ul li {
    text-align: center;
    line-height: 400px;
    font-size: 50px;
    color: #aaa;
    position: relative;
}

.slider ol {
    position: absolute;
    left: 5%;
    top: 50%;
    padding-right: 15px;
    -webkit-transform: translate(0, -50%);
    -moz-transform: translate(0, -50%);
    -o-transform: translate(0, -50%);
    transform: translate(0, -50%);
    list-style: none;
}
.slider ol li {
    width: 7px;
    height: 30px;
    margin-bottom: 5px;
    color: #999;
    cursor: pointer;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    position: relative;
    transition: all 0.5s ease-in-out;
}
.slider ol li:hover, .slider ol li.active {
    background: transparent;
    color: #fff;
    font-size: 40px;
    margin-bottom: 30px;

    transition: all 0.5s ease-in-out;
}

.slider ol li:hover::before, .slider ol li.active::before{
    position: absolute;
    top: 39px;
    left: -28px;
    content: "";
    width: 26px;
    height: 3px;
    background-color: #fff;
}