styles.css

.translation-btn,
.btn-error::before {
  box-sizing: border-box;
  position: absolute;
  left: 50%;
  box-shadow: 0px 0px 10px 2px rgba(34, 60, 80, 0.5);
  border-radius: 0.5rem;
}

.translation-btn {
  width: 5rem;
  padding: 1.5rem;
  background: no-repeat center black
    url(https://icongr.am/entypo/language.svg?size=25&color=ffffff);
  top: 3rem;
  opacity: 0;
}

.translation-btn:hover {
  opacity: 1;
}

.btn-error::before {
  content: attr(data-error);
  font-size: 1.3rem;
  top: 4rem;
  transform: translate(-50%);
  width: max-content;
  padding: 0.5rem;
  color: white;
  background-color: black;
}

.btn-succes {
  background: no-repeat center black
    url(https://icongr.am/entypo/controller-paus.svg?size=20&color=ffffff);
}