Hello @technase ,
firstly remove this and add below i have given,
@media screen and (min-width: 750px) {
.footer-block__details-content .list-menu__item--link:hover, .copyright__content a:hover {
text-decoration: underline;
text-underline-offset: .3rem;
}
}
footer .footer-block__details-content a{
position: relative;
}
footer .footer-block__details-content a::after {
content: ' ';
position: absolute;
width: 0;
height: 2px;
background: #000;
top: 70%;
left: 0;
transition: all ease 0.3s;
-webkit-transition: all ease 0.3s;
-moz-transition: all ease 0.3s;
}
footer .footer-block__details-content a:hover::after{
width: 100%;
}
check this recording for result : https://www.awesomescreenshot.com/video/32813231?key=5f94425164e14c9c65e15faa8ebd0297