$color: #333;

.underline-button {
  color: $color;
  cursor: pointer;
  user-select: none;
  text-align: center;
  padding: 15px 0;
  font-size: 24px;

  &:after {
    content: "";
    display: block;
    width: 50%;
    height: 1px;
    margin-left: auto;
    margin-right: auto;
    background: $color;
    transition: width 0.3s;
  }

  &:hover {
    &:after {
      width: 100%;
    }
  }

  &:active {
    :after {
      width: 0;
    }
  }
}

<div>
  <div class="underline-button">Button</div>
  <div class="underline-button">Button</div>
  <div class="underline-button">Button</div>
  <div class="underline-button">Button</div>
  <div class="underline-button">Button</div>
  <div class="underline-button">Button</div>
</div>