.browser-mockup {
  border-top: 2em solid #48758A;
  position: relative;
  border-radius: 10px 3px 0 0
}
.browser-mockup:before {
  display: block;
  position: absolute;
  content: '';
  top: -1.25em;
  left: 1em;
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  background-color: #f44;
}
.browser-mockup.with-tab:after {
  display: block;
  position: absolute;
  content: '';
  width: 20%;
  height: 0em;
  border-bottom: 2em solid white;
  border-left: 0.8em solid transparent;
  border-right: 0.8em solid transparent;
}