Simple hover info with css

_hover_info

.hover-info {
  $pd: 20px; // Padding
  $bd: 1px; // Border width
  $bdr: 8px; // Border radius
  $bdc: rgba(0, 0, 0, 0.1); // Border color
  $bsh: 2px 2px 2px rgba(0, 0, 0, 0.2); // Box shadow

  .hover-details {
    display: none;
  }

  &:hover {
    position: relative;
    background: white;
    z-index: 100;

    border-radius: $bdr $bdr 0 0;
    border: $bd solid $bdc;
    border-bottom: none;

    margin: -#{$pd+$bd} -#{$pd+$bd} 0;
    padding: $pd $pd 0;

    box-shadow: $bsh;

    .hover-details {
      display: inline-block;
      position: absolute;
      background: white;
      right: 0;
      left: 0;

      border-color: $bdc;
      border-width: $bd;
      border-style: none solid solid;
      border-radius: 0 0 $bdr $bdr;

      margin: 0 -#{$bd} -#{$bd};
      padding: 0 $pd $pd;

      box-shadow: $bsh;
    }
  }

  // Clearfix for vertical margin collapsing
  &:before,
  &:after {
    display: table;
    line-height: 0;
    content: "";
  }
  &:after {
    clear: both;
  }
}