テキスト<a href="#" class="cp_textlink01">リンクテキスト-link text-</a>テキスト
.cp_textlink01 {
position: relative;
padding: 0.1em 0.3em;
text-decoration: none;
color: #FB8C00;
}
.cp_textlink01::after {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
content: '';
transition: all 0.3s ease;
opacity: 0.8;
border-bottom-width: 1px;
border-bottom-style: dotted;
border-bottom-color: #FB8C00;
}
.cp_textlink01:hover::after {
opacity: 1;
border-bottom-width: 2px;
border-bottom-style: dashed;
}