input, button {
  float: left;
  font-size: 1em;
  padding: 3px 6px;
  margin: 0;
  border: 1px solid #333;
  outline: 0;
  box-shadow: none;
}

::-moz-focus-inner { 
  padding: 0;
  border: 0;
}

input {
  width: 15em;
  background-color: #fff;
  border-right: 0 none;
  border-radius: 3px 0 0 3px;
}

button {
  position: relative;
  background-color: #aaa;
  border-radius: 0 3px 3px 0;
  cursor: pointer;
}

.copied::after {
  position: absolute;
  top: 12%;
  right: 110%;
  display: block;
  content: "copied";
  font-size: 0.75em;
  padding: 2px 3px;
  color: #fff;
  background-color: #22a;
  border-radius: 3px;
  opacity: 0;
  will-change: opacity, transform;
  animation: showcopied 1.5s ease;
}

@keyframes showcopied {
  0% {
    opacity: 0;
    transform: translateX(100%);
  }
  70% {
    opacity: 1;
    transform: translateX(0);
  }
  100% {
    opacity: 0;
  }
}