.c-button {
  appearance: none;
  background-color: $action-color;
  border: 0;
  border-radius: $base-border-radius;
  color: $white;
  cursor: pointer;
  display: inline-block;
  font-family: $base-font-family;
  font-size: modular-scale(0);
  -webkit-font-smoothing: antialiased;
  font-weight: 600;
  line-height: 2;
  padding: 0 modular-scale(0);
  text-align: center;
  text-decoration: none;
  transition: background-color $base-duration $base-timing;
  user-select: none;
  vertical-align: middle;
  white-space: nowrap;

  &:hover,
  &:focus {
    background-color: shade($action-color, 20%);
    color: $white;
  }

  &:disabled {
    cursor: not-allowed;
    opacity: 0.5;

    &:hover {
      background-color: $action-color;
    }
  }
}

.c-button {
  appearance: none;
  background-color: $action-color;
  border: 1px solid $action-color;
  border-radius: $base-border-radius;
  color: $white;
  cursor: pointer;
  display: inline-block;
  font-family: $base-font-family;
  font-size: modular-scale(0);
  -webkit-font-smoothing: antialiased;
  font-weight: 600;
  line-height: 2;
  padding: 0 modular-scale(0);
  text-align: center;
  text-decoration: none;
  transition: background-color $base-duration $base-timing,
              border-color $base-duration $base-timing;
  user-select: none;
  vertical-align: middle;
  white-space: nowrap;

  &:hover,
  &:focus {
    background-color: shade($action-color, 10%);
    border-color: shade($action-color, 10%);
    color: $white;
  }

  &:disabled {
    cursor: not-allowed;
    opacity: 0.5;

    &:hover {
      background-color: $action-color;
    }
  }
}

Add border to buttons to match input height
Add border to buttons to match input height
