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<a href="#" class="button">анкор</a>

.button
{
    display: inline-block;
    border: none;
    color: #fff;
    text-decoration: none;
    background-color: $accent;
    padding: 15px 45px;
    font-size: 13px;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 3px;
    border-radius: 2px;
    text-align: center;
    position: relative;
    outline: none;
    transition: background-color .1s ease;
    }

   .button::after {
        transition: background-color .2s ease;
        position: absolute;
        content: '';
        height: 4px;
        bottom: 0;
        width: 100%;
        background-color: darken($accent, 50%);
        opacity: .18;
        border-bottom-left-radius: 2px;
        border-bottom-right-radius: 2px;
        left: 0;
        }

    .button:focus,  .button:hover {
        text-decoration: none;
        color: #fff;
        }
     .button:hover {
        background-color: lighten($accent, 5%);
        }
      .button:hover::after {
            opacity: .22;
      }
    .button:active {
        background-color: darken($accent, 5%);
        }
       .button:active::after {
            opacity: .32;   
      }