.inhalt h3, a, h4 {
  text-shadow: 5px 3px 3px #000;
}

.inhalt h4 {
  font-weight: normal;
}

body {
  margin-bottom: 8em;
}

.button {
  position: relative;
  float: left;
  width: 10em;
  height: 10em;
  margin: 1.5em;
  border: solid 3px #111;
  border-radius: 1em;
  cursor: pointer;
  transition: 0.2s;
  box-shadow: 10px 7px 10px #000;
  background-color: #000;
}

.button span {
  position: absolute;
  font-size: 20px;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  color: rgba(255,255,255,0);
  transition: 0.2s;
}

.button div {
  position: absolute;
  background-color: rgba(0,0,0,0);
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: 0.2s;
  border-radius: 0.7em;
}

#button {
  background-image: url("../img/calculator.svg");
  background-size: cover;
  background-position: center;
}

.button:hover > div {
  background-color: rgba(0,0,0,0.8);
}

.button:hover > span {
  color: rgba(255,255,255, 1);
}

@media (orientation: portrait) {
  .button div {
    background-color: rgba(0,0,0,0.6);
  }

  .button {
    box-shadow: 30px 21px 20px #000;
  }

  .button span {
    color: rgba(255,255,255, 1);
    font-size: 3rem;
  }
}