Bootstrap/less/popovers.less

//
// Popovers
// --------------------------------------------------


.popover {
  position: absolute;
  top: 0;
  left: 0;
  z-index: @zindex-popover;
  display: none;
  max-width: 276px;
  padding: 1px;
  text-align: left; // Reset given new insertion method
  background-color: @popover-background;
  -webkit-background-clip: padding-box;
     -moz-background-clip: padding;
          background-clip: padding-box;
  border: 1px solid #ccc;
  border: 1px solid rgba(0,0,0,.2);
  border-radius: 6px;
  .box-shadow(0 5px 10px rgba(0,0,0,.2));

  // Overrides for proper insertion
  white-space: normal;

  // Offset the popover to account for the popover arrow
  &.top     { margin-top: -10px; }
  &.right   { margin-left: 10px; }
  &.bottom  { margin-top: 10px; }
  &.left    { margin-left: -10px; }
}

.popover-title {
  margin: 0; // reset heading margin
  padding: 8px 14px;
  font-size: 14px;
  font-weight: normal;
  line-height: 18px;
  background-color: @popover-title-background;
  border-bottom: 1px solid darken(@popover-title-background, 5%);
  border-radius: 5px 5px 0 0;

  &:empty {
    display: none;
  }
}

.popover-content {
  padding: 9px 14px;
}

// Arrows
//
// .arrow is outer, .arrow:after is inner

.popover .arrow,
.popover .arrow:after {
  position: absolute;
  display: block;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
}
.popover .arrow {
  border-width: @popover-arrow-outer-width;
}
.popover .arrow:after {
  border-width: @popover-arrow-width;
  content: "";
}

.popover {
  &.top .arrow {
    left: 50%;
    margin-left: -@popover-arrow-outer-width;
    border-bottom-width: 0;
    border-top-color: #999; // IE8 fallback
    border-top-color: @popover-arrow-outer-color;
    bottom: -@popover-arrow-outer-width;
    &:after {
      bottom: 1px;
      margin-left: -@popover-arrow-width;
      border-bottom-width: 0;
      border-top-color: @popover-arrow-color;
    }
  }
  &.right .arrow {
    top: 50%;
    left: -@popover-arrow-outer-width;
    margin-top: -@popover-arrow-outer-width;
    border-left-width: 0;
    border-right-color: #999; // IE8 fallback
    border-right-color: @popover-arrow-outer-color;
    &:after {
      left: 1px;
      bottom: -@popover-arrow-width;
      border-left-width: 0;
      border-right-color: @popover-arrow-color;
    }
  }
  &.bottom .arrow {
    left: 50%;
    margin-left: -@popover-arrow-outer-width;
    border-top-width: 0;
    border-bottom-color: #999; // IE8 fallback
    border-bottom-color: @popover-arrow-outer-color;
    top: -@popover-arrow-outer-width;
    &:after {
      top: 1px;
      margin-left: -@popover-arrow-width;
      border-top-width: 0;
      border-bottom-color: @popover-arrow-color;
    }
  }

  &.left .arrow {
    top: 50%;
    right: -@popover-arrow-outer-width;
    margin-top: -@popover-arrow-outer-width;
    border-right-width: 0;
    border-left-color: #999; // IE8 fallback
    border-left-color: @popover-arrow-outer-color;
    &:after {
      right: 1px;
      border-right-width: 0;
      border-left-color: @popover-arrow-color;
      bottom: -@popover-arrow-width;
    }
  }

}