button.css

.btn {
  padding: 0;
  border: none;
  font: inherit;
  color: inherit;
  background-color: transparent;
  cursor: pointer;
  outline: none;
  
  display: inline-block;
  text-align: center;
  text-decoration: none;

  margin: 2px 0;

  border: solid 1px transparent;
  border-radius: 4px;

  padding: 0.5em 1em;

  color: #ffffff;
  background-color: #9555af;
}

.btn:active {
  transform: translateY(1px);
  filter: saturate(150%);
}

.btn:hover,
.btn:focus {
  color: #9555af;
  border-color: currentColor;
  background-color: white;
}

.btn::-moz-focus-inner {
  border: none;
}