.wln-wrap__button--show-all::before
{
    color: black;
    -webkit-transition: all 300ms ease-in-out;
	-moz-transition: all 300ms ease-in-out;
	-o-transition: all 300ms ease-in-out;
	transition: all 300ms ease-in-out;
}

.wln-wrap__button--show-all:hover::before
{
    color: yellow;
}