sort icon pure css

HTML

<i class="sort-by-desc"></i>
<i class="sort-by-asc"></i>

CSS

.sort-by-asc
{
    left: 3px;
    display: inline-block;
    width: 0;
    height: 0;
    border: solid 5px transparent;
    margin: 4px 4px 0 3px;
    background: transparent;
    border-bottom: solid 7px #F80;
    border-top-width: 0;
}

.sort-by-desc
{
    left: 5px;
    display: inline-block;
    width: 0;
    height: 0;
    border: solid 5px transparent;
    margin: 4px 4px 0 3px;
    background: transparent;
    border-top: solid 7px #F80;
    border-bottom-width: 0;
}