.browser-info__open {
  display: none;
  opacity: 0;
}
.browser-info__open.shown {
  left: 20px;
  bottom: 0;
  border: none;
  background-color: #d6d6d6;
  font-size: 12px;
  line-height: 20px;
  border-radius: 2px 2px 0 0;
  -webkit-transition: all .3s;
  -o-transition: all .3s;
  transition: all .3s;
  position: fixed;
  opacity: .6;
  cursor: pointer;
  will-change: transform;
  display: block;
}
.browser-info__open:hover {
  opacity: 1;
}

body.browser-info-show .browser-info {
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  opacity: 1;
  display: block;
}
body.browser-info-show .browser-info-open {
  opacity: 0;
}