.wrapper {
    width: 70%;
    margin: auto;
    padding-bottom: 10vmax;
}

.wrapper ul {
    font-size: 21px;
    margin-top: 4em;
    position: relative;
    padding-left: 1em;
    line-height: 1em;
    display: inline-block;
}

.wrapper ul::before {
    content:"";
    height: 100%;
    width: 2px;
    position: absolute;
    left: 0;
    top: 0;
    background: -webkit-gradient(linear, left bottom, left top, from(transparent), color-stop(50%, white), to(transparent));
    background: -o-linear-gradient(bottom, transparent 0%, white 50%, transparent 100%);
    background: linear-gradient(0deg, transparent 0%, white 50%, transparent 100%);
}

.wrapper li {
    margin-bottom: .5em;
}

.wrapper li:last-of-type {
    margin-bottom: 0;
}

.wrapper li a {
    position: relative;
}

.wrapper li a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    -webkit-transform: translate(-50%) scaleY(0);
        -ms-transform: translate(-50%) scaleY(0);
            transform: translate(-50%) scaleY(0);
    height: 40%;
    width: 100%;
    width: -webkit-calc(100% + .5em);
    width: calc(100% + .5em);
    z-index: -1;
    background-color: #444;
    -webkit-transition: -webkit-transform .2s cubic-bezier(0,.5,.56,1.01);
    transition: -webkit-transform .2s cubic-bezier(0,.5,.56,1.01);
    -o-transition: transform .2s cubic-bezier(0,.5,.56,1.01);
    transition: transform .2s cubic-bezier(0,.5,.56,1.01);
    transition: transform .2s cubic-bezier(0,.5,.56,1.01), -webkit-transform .2s cubic-bezier(0,.5,.56,1.01);
    -webkit-transform-origin: 50% 100%;
        -ms-transform-origin: 50% 100%;
            transform-origin: 50% 100%;
    pointer-events: none;
}

.wrapper li a:hover::after {
    -webkit-transform: translate(-50%) scaleY(1);
        -ms-transform: translate(-50%) scaleY(1);
            transform: translate(-50%) scaleY(1);
}

@media only screen and (max-width: 850px) {
    .wrapper {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-pack: center;
        -webkit-justify-content: center;
            -ms-flex-pack: center;
                justify-content: center;
    }
    .wrapper ul {
        padding-left: 0;
        text-align: center;
    }
    .wrapper ul::before {
        content: none;
    }
}