.link_hover{
    background-image: linear-gradient(currentColor, currentColor);
    background-position: 0% 100%;
    background-repeat: no-repeat;
    background-size: 0% 2px;
    transition: background-size .3s;
}
.link_hover:hover{
    transition: 0.2s;
    background-size: 100% 2px;
}

.link_hover_black:hover{
    opacity: 60% !important;
    transition: 0.2s;
}
.link_hover, .link_hover_black:not(:hover){
    transition: 0.2s!important;
}