Example: SCSS

Button.module.scss

@import 'styles/utils/mixins';

.button {
  @include fontSize(16px, 24px);
  @include flex(row, center, center);

  background: $yellow500;
  color: $gray900;
  border: solid 1px rgb($gray900, 0);
  display: inline-block;
  font-family: $default-font;
  font-weight: 500;
  box-sizing: border-box;
  border-radius: 5px;
  padding: 16px 32px;
  min-height: 56px;
  user-select: none;
  text-decoration: none;
  transition:
    background-color 0.1s ease-in-out,
    color 0.1s ease-in-out,
    transform 0.15s ease-in-out,
    border-color 0.2s ease-in-out;

  &:hover {
    background: $yellow300;
    cursor: pointer;
    transform: scale(0.95);
  }

  &:active {
    background: $yellow600;
  }

  &:disabled {
    background: $gray50;
    color: $gray400;
    cursor: default;
    transform: none;
  }
}

.secondary {
  background: none;
  border-color: $gray900;

  &:disabled {
    background: none;
    color: $gray400;
    border-color: $gray300;
    cursor: default;
  }
}

.dark {
  background: none;
  color: $gray0;
  border-color: $gray0;

  &:hover {
    background: $yellow300;
    color: $gray900;
    border-color: rgb($gray100, 0);
  }

  &:active {
    background: $yellow600;
  }

  &:disabled {
    background: none;
    color: $gray400;
    border-color: $gray500;
  }
}

.dark.secondary {
  color: $gray400;
  border-color: $gray500;

  &:hover {
    background: $gray0;
    color: $gray900;
    border-color: rgb($gray100, 0);
  }

  &:active {
    background: $gray200;
  }

  &:disabled {
    background: none;
    color: $gray400;
    border-color: $gray500;
  }
}