lbry.tech/app/sass/init/_extends.scss

/**
 * Button
 *
 * @class     .__button-base
 * @class     .__button-basic
 *
 * @class     .__button-plain
 * @selector  {::after}
 * @state     {:hover}
 *
 * @class     .__button-black
 * @state     {:hover}
 *
 * @class     .__button-white
 * @state     {:hover}
 *
 * @class     .__button-gray
 * @state     {:hover}
 *
 * @class     .__button-padding-horizontal
 * @class     .__button-padding-vertical
 */

.__button-base {
  border: 1px solid;
  font-size: 1rem;
  letter-spacing: 0.025rem;
  position: relative;
  transition: all 0.2s;
}

.__button-basic {
  @extend .__button-base;
}

.__button-plain {
  @extend .__button-base;
  background-color: transparent;
  border-color: transparent;

  &::after {
    width: 100%; height: 2px;
    bottom: 2px; left: 0;

    content: "";
    display: block;
    transition: background-color 0.2s;
  }

  &:not(:hover)::after {
    background-color: transparent;
  }

  &:hover::after {
    background-color: $black;
  }
}

.__button-black {
  @extend .__button-base;
  @extend .__button-padding-vertical;
  @extend .__button-padding-horizontal;

  &:not(:hover) {
    background-color: $black;
    border-color: $white;
    box-shadow: 2px 2px 0 $white;
    color: $white;
  }

  &:hover {
    background-color: $white;
    border-color: $black;
    box-shadow: 2px 2px 0 $black;
    color: inherit;
  }
}

.__button-white {
  @extend .__button-base;
  @extend .__button-padding-vertical;
  @extend .__button-padding-horizontal;

  &:not(:hover) {
    background-color: $white;
    border-color: transparent;
    box-shadow: 2px 2px 0 $black;
    color: inherit;
  }

  &:hover {
    background-color: $black;
    border-color: $white;
    box-shadow: 2px 2px 0 $white;
    color: $white;
  }
}

.__button-gray {
  @extend .__button-base;
  @extend .__button-padding-vertical;
  @extend .__button-padding-horizontal;

  background-color: $white;

  &:not(:hover) {
    border-color: transparent;
    box-shadow: 2px 2px 0 $black;
  }

  &:hover {
    border-color: $teal;
    box-shadow: 2px 2px 0 $teal;
    color: $teal;
  }
}

.__button-padding-horizontal {
  padding-right: 1rem;
  padding-left: 1rem;
}

.__button-padding-vertical {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}



/**
 * Loader
 *
 * @class     .__loading
 * @selector  {::before}
 * @selector  {::after}
 */

.__loading {
  width: 100%; height: 10rem;

  cursor: wait;
  position: relative;

  &::before {
    width: 4rem; height: 4rem;
    top: 2rem; left: calc(50% - 2rem);

    animation: spin 2s linear infinite;
    border-radius: 50%;
    border-style: solid;
    border-top-color: $teal;
    border-width: 6px;
    content: "";
    cursor: wait;
    position: absolute;
  }

  &::after {
    top: 7rem; left: 0;

    cursor: wait;
    font-size: 1rem;
    position: absolute;
    text-align: center;
    width: 100%;
  }
}