.sourceLink,
.sandboxButton {
  position: fixed;
  top: 0;
  right: 0;
  padding: 130px 50px 5px 50px;
  font: 10px helvetica, sans-serif;
  display: inline-block;
  background: rgb(12, 35, 194);
  color: #fff;
  text-decoration: none;
  transform: translate(50%, -50%) rotateZ(45deg);
  transition: background 100ms;
}
.sourceLink:hover:not(:active) {
  background: rgb(102, 135, 244);
}

.sandboxButton {
  top: 30px;
  right: 30px;
  background: rgb(12, 194, 68);
  padding: 130px 100px 5px 100px;
  border: none;
  cursor: pointer;
  outline: none;
}
.sandboxButton:hover:not(:active) {
  background: rgb(128, 242, 137);
}