tether/dist/css/tether.css

A client-side library to make absolutely positioned elements attach to elements in the page efficiently.

.tether-element, .tether-element:after, .tether-element:before, .tether-element *, .tether-element *:after, .tether-element *:before {
  box-sizing: border-box;
}

.tether-element {
  position: absolute;
  display: none;
}
.tether-element.tether-open {
  display: block;
}