tweb-i2p/src/scss/partials/_button.scss

.btn-icon {
  text-align: center;
  font-size: 1.5rem;
  line-height: 1.5rem;
  border-radius: 50% !important;
  transition: background-color .15s ease-in-out, opacity .15s ease-in-out;
  color: $color-gray;
  cursor: pointer;
  background-color: transparent;
  border: none;
  padding: .5rem;
  position: relative;
  overflow: hidden;
  
  /* kostil */
  display: flex;
  align-items: center;
  justify-content: center;

  &.active {
    color: $color-blue;
  }
  
  html.no-touch &:hover {
    background-color: var(--color-gray-hover);
  }

  &:disabled {
    color: #cacaca;
    pointer-events: none !important;
    opacity: .25;
  }
}

.btn-corner {
  --translateY: calc(100% + 20px);
  position: absolute !important;
  bottom: 20px;
  right: 20px;
  //transition: .2s ease;
  transition: transform var(--btn-corner-transition) !important;
  transform: translate3d(0, var(--translateY), 0);
  z-index: 3;
  user-select: none;
  background-color: $color-blue;
  text-align: center;
  font-size: 1.5rem;
  color: #fff;
  border: none;
  outline: none;
  cursor: pointer;
  
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 !important;
  
  &.is-visible {
    --translateY: 0;
  }

  body.animation-level-0 & {
		transition: none !important;
  }
  
  &:disabled {
    opacity: 1 !important;
    pointer-events: all !important;
  }
}

.btn-menu {
  visibility: hidden;
  position: absolute;
  background: #fff;
  box-shadow: 0 5px 8px 1px rgba(0, 0, 0, .24);
  z-index: 3;
  top: 100%;
  padding: 9px 0;
  border-radius: $border-radius-medium;
  opacity: 0;
  transform: scale(.8);
  transition-property: opacity, transform, visibility;
  transition-duration: .2s;
  transition-timing-function: cubic-bezier(.4, 0, .2, 1);
  font-size: 16px;

  -webkit-user-select: none; /* disable selection/Copy of UIWebView */
  -webkit-touch-callout: none; /* disable the IOS popup when long-press on a link */

  &.active {
    visibility: visible;
    opacity: 1;
    transform: scale(1);
  }

  &:not(.active) {
    &, .btn-menu-item {
      pointer-events: none !important;
    }
  }

  &.bottom-left {
    right: 0;
    top: 100%;
    transform-origin: top right;
  }

  &.bottom-right {
    left: 0;
    top: 100%;
    transform-origin: top left;
  }

  &.bottom-center {
    transform-origin: top center;
  }

  &.top-left {
    top: initial;
    right: 0;
    bottom: 100%;
    transform-origin: bottom right;
  }

  &.top-right {
    top: initial;
    left: 0;
    bottom: 100%;
    transform-origin: bottom left;
  }

  &.center-left {
    transform-origin: center right;
  }

  &.center-right {
    transform-origin: center left;
  }

  &-item {
    display: flex;
    position: relative;
    padding: 0 40px 0 20px;
    height: 56px;
    cursor: pointer !important;
    pointer-events: all !important;
    background-position: 16px center;
    background-size: 24px 24px;
    background-repeat: no-repeat;
    color: #000;
    text-transform: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    align-items: center;

    html.no-touch &:hover {
      background-color: rgba(112, 117, 121, .06);
    }

    &:before {
      color: $color-gray;
      font-size: 1.5rem;
      margin-right: 32px;
    }

    @include respond-to(handhelds) {
      padding: 0 30px 0 16px;
      height: 50px;
    }
  }

  /* &-overlay {
    position: fixed !important;
    left: -100vw;
    right: -100vw;
    top: -100vh;
    bottom: -100vh;
    z-index: 1;
    background-color: rgba(0, 0, 0, .2);
  } */
  &-overlay {
    position: fixed !important;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 1;
    cursor: default;
    user-select: none;
    //background-color: rgba(0, 0, 0, .2);
  }

  /* &-toggle  */&-overlay {
    left: -100vw;
    right: -100vw;
    top: -100vh;
    bottom: -100vh;

    width: auto !important;
    max-width: none !important;
  }
}

.btn-primary {
  background-color: $color-blue;
  color: #fff;
  border-radius: $border-radius-medium;
  width: 100%;
  text-align: center;
  height: 54px;
  border: none;
  font-weight: 500;
  cursor: pointer;
  overflow: hidden;
  position: relative;
  padding: 0; // new
  transition: .2s opacity;
 
  html.no-touch &:hover {
    transition: .2s background-color, .2s opacity;
    background: darken($color-blue, 8%);
  }
  
  svg, use {
    height: calc(100% - 20px);
    right: 15px;
    left: auto;
  }

  &:disabled {
    pointer-events: none !important;
    opacity: .25;
  }
}

// ! example: multiselect input, button in pinned messages chat
.btn-transparent {
  color: #000;
  background-color: transparent;
  display: flex;
  align-items: center;
  padding: 0 .875rem;
  //width: auto;
  text-transform: capitalize;
  font-weight: normal;

  html.no-touch &:hover {
    background-color:	var(--color-gray-hover);
  }

  // * tgico
  &:before {
    color: #707579;
    font-size: 1.5rem;
    margin-right: 2rem;
  }

  &.btn-short:before {
    margin-right: 1rem;
  }
}

.btn-primary.btn-circle {
  .preloader-circular {
    height: calc(100% - 20px);
    right: auto;
    left: auto;
    margin: 0;
    top: 10px;
    
    .preloader-path {
      stroke: #fff;
    }
  }
}

.btn-menu-toggle {
  position: relative;
  overflow: visible !important;
  font-weight: normal !important;
  cursor: pointer !important;
  pointer-events: all !important;

  &:not(.btn-primary):not(.btn-corner).menu-open {
    background-color: var(--color-gray-hover);
  }

  .btn-menu {
    margin-top: .5rem;
  }
}

.btn-circle {
  border-radius: 50%;
  height: 54px;
  width: 54px;
  line-height: 54px;
  
  @include respond-to(handhelds) {
    height: 46px;
    width: 46px;
  }
  
  path {
    fill: white;
  }
}

.btn-disabled {
  pointer-events: none !important;
  cursor: default !important;
  color: #707579 !important;

  &:before {
    color: #707579 !important;
  }
}