Sunnyside-Agency Responsive Landing Page using Flexbox and CSS Grid

You can use the border-bottom property in css for those links and when you hover over those links you can also change the color.

For example:

.learn-more-link { border-bottom: 5px solid pink; }

.learn-more-link:hover { border-bottom: 5px solid orange; }

If you don't want the colors to change instantly, check out the transition property.

@Juan2579 You can add the underline by wrapping the link tag with a div container and an empty div below the link

        <div class="container">
          <a href="#" class="styled_button yellow"> Learn more</a>
          <div class="yellow_line"></div>
        </div>

add these styles for the yellow_line and red_line

.red_line,
.yellow_line {
    width: calc(100% + 0.5rem);
    height: 0.3rem;
    border-radius: 1rem;
    bottom: 0;
    left: 0;
    right: 0;
    margin-top: -0.4rem;
    background: transparent;
}

after that you can show the lines on hover with these styles

.styled_button:hover+.yellow_line {
    background: var(--yellow);
}

.styled_button:hover+.red_line {
    background: var(--soft-red);
}