.button {
  display: inline-block;
  padding: 0.75rem 2.5rem;
  border-radius: 10rem;
  border: none;
  color: #fff;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.15rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
  z-index: 1;
  text-decoration: none;
  text-align: center;
}

.button:hover {
  color: #fff;
  box-shadow: none;
}

.button:hover:before {
  width: 100%;
}

.redButton:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: red;
  border-radius: 10rem;
  z-index: -2;
}

.redButton:before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 100%;
  background-color: rgb(226, 22, 22);
  transition: all 0.3s;
  border-radius: 10rem;
  z-index: -1;
}