.line_arrow{
    text-decoration: none;
    width: 1.5em;
    height: 1.5em;
    position: absolute;
    top: 88%;
    overflow: hidden;
    z-index: 5;
}
.control_prev{
    border-top: 4px solid hsl(0, 0%, 40%);
    border-left: 4px solid hsl(0, 0%, 40%);
    transform: rotate(-54deg) skew(-20deg);
    -ms-transform: rotate(-54deg) skew(-20deg);
    left: 4px;
}
.control_next{
    border-top: 4px solid hsl(0, 0%, 40%);
    border-right: 4px solid hsl(0, 0%, 40%);
    transform: rotate(54deg) skew(20deg);
    -ms-transform: rotate(54deg) skew(20deg);
    right: 4px;
}