_button.scss

.button {
  --button-color-1: #1f1f1f;
  --button-color-2: white;
  --button-color-3: #fbce51;

	display: flex;
  align-items: center;
  justify-content: center;

  width: 100%;
  box-sizing: border-box;
  padding: 20px 18px;
  border: 0;
  border-radius: 9999px;
  background-color: var(--button-color-1);

  color: var(--button-color-2);
  font: 500 16px/130% var(--default-font);
  text-align: center;
  text-decoration: none;

  transition:
    background-color .5s,
    color .1s;

  &:hover {
    background-color: var(--button-color-3);
    color: var(--button-color-1);
  }
}

.button_secondary {
  opacity: .9;
	background-color: var(--button-color-2);
  color: var(--button-color-1);

  &:hover {
    background-color: var(--button-color-1);
    color: var(--button-color-2);
  }
}

@include breakpoint {

  .button {
    padding: 20px 49px;
  }

  .button_secondary {
    opacity: 1;
    background-color: initial;
    border: 2px solid var(--button-color-1);
  }

}