Text link underline on hover

I'm wondering if anyone knows how this website is doing their text link hovers? The line is present, on hover the line slides, the reappears. Take a look at the attached screenshot but it looks like it's on all of their text links. 

https://vucko.co

I'm trying to do it on my site where the red links are.

https://toucan-tetra-fwm2.squarespace.com/

p: argus

I see you able to figure it out with similar effect, do you still need help or no need?

Yes. It's not the same one I'm looking for. If you could review both and let me know how about above question that would be great.

On 3/26/2024 at 2:02 AM, orkoellis said:

Yes. It's not the same one I'm looking for. If you could review both and let me know how about above question that would be great.

You can use this CSS code

@media screen and (min-width: 992px) {
.fe-65edd51d8962b678caa6a783 .sqs-html-content a:before {
    content: "";
    display: block;
    position: absolute;
    background-color: #000;
    height: 0.05em;
    width: auto;
    bottom: -0.275em;
    left: 0;
    right: 0;
    transform: scaleX(1);
    transform-origin: left;
    transition: transform .55s cubic-bezier(.785,.135,.15,.86);
    transition-delay: .5s;
    border: unset;
}
.fe-65edd51d8962b678caa6a783 .sqs-html-content a:after {
    content: "";
    background-color: #000;
    height: 0.05em;
    width: auto;
    display: block;
    position: absolute;
    bottom: -0.275em;
    left: 0;
    right: 0;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform .55s cubic-bezier(.785,.135,.15,.86);
    transition-delay: 0s;
    border: unset;
}
.fe-65edd51d8962b678caa6a783 .sqs-html-content a:hover:before {
    transform: scaleX(0);
    transform-origin: right;
    transition: transform .55s cubic-bezier(.785,.135,.15,.86);
    transition-delay: 0s;
}
.fe-65edd51d8962b678caa6a783 .sqs-html-content a:hover:after {
    transform: scaleX(1);
    transform-origin: left;
    transition: transform .55s cubic-bezier(.785,.135,.15,.86);
    transition-delay: .2s;
}}